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Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
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It only messed with me when I was logged in to my VEX account. When I logged off it worked fine. Now all is right...even when logged in... after the fix you applied... thanks for helping.. R |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
How are wedgetop and roughtop designed to be attached to the traction wheels? Drill some through holes and use rivets?
EDIT: BTW, I noticed that product 217-2712 was not listed in the "Specifications" section of this page: http://www.vexrobotics.com/vexpro/ge...pro-gears.html |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
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JVN can clarify, but I would assume those weights are fully dressed with the mounting bracket and the pneumatic cylinder. Congratulations to everyone at IFI, the entire product line is simply amazing, I already have a long shopping list. Christmas came early this year! The VEXpro line may just cause more traffic here on CD, than a 2013 FRC game hint! :yikes: |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
Interesting phenomenon we're seeing...
We've had a few VEXpro Ball Shifter sales, and most of these orders include a pneumatic pancake cylinder, and encoder mounts. These are included. Every ball shifter includes the pneumatic cylinder, all the hardware to mount it, and all the hardware for encoder mounting. I've asked out web-team to try to be more clear on the product page. -John |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
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Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
Can you post the dimensions of the VersaHub? Definitely looks like something we'll be using in the near future.
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Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
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I hope if you order the optional gear kit along with the 3-stage shifter you get both the 60:24 and 64:20 gear sets - because that's what I did and that's what I wanted... |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
JVN, can you comment on the material of the Ball Shifter casing? I assume it is some sort of plastic. I've had a lot of trouble with polycarb sideplates making motors overheat in drive gearboxes in the past. Have you tested for this? Also, any plan to sell aluminium versions of the casing (as side plates with spacers)?
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Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
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-John |
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Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
Are the parts lists for the 2 and 3 stage ball shifters mixed up?
The 2 stage lists "Ball Shifter Long Output Shaft Assembly with 60t and 44t Ball Shifter Gears" The 3 stage lists "Ball Shifter Short Output Shaft Assembly with 60t and 44t Ball Shifter Gears" The images (and CAD) show the 2 stage with a shorter output shaft than the 3 stage, which I assume is correct. Any ideas for using the 3-stage shifter for a WCD/direct driven center wheel? The lower housing hex standoffs look like they will interfere with putting a 16T #25 sprocket on the drive axle to power the front/rear wheels. Turning the gearbox sideways would work, but that eats up >2" of ground clearance, meaning at least 6" wheels would be required. |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
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Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
For anyone interested, a friend of mine made a consolidated zip folder with STEP files for every available vexpro product that was just released.
He's hosting it on his google drive: https://docs.google.com/file/d/0Bx6d...FyZTdQSlE/edit Beware: Google Drive has a download cap, so if someone were to mirror this, that would be appreciated. |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
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With 5" wheels, the 60:24 3rd stage would give you speeds of 5.5 ft/s and 12.6 ft/s (probably ~4.5 and ~10.2 after accounting for 80% of theoretical). Current draw would be right under 40A at stall in low gear, which is ideal. Would have been near perfect for the 2012 game. Playing with making aluminum plates to replace the housing, will be heavier but at least mounting will be easier. |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
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Are going to be any assembly instruction videos (attaching the wheel to the hub, hub to sprocket) going up by any chance? I feel like it might be helpful to some teams decided whether or not to go with these or not, knowing how to put them together is great.
Overall, this is a GREAT thing, and I would like to thank IFI for it. (I am almost happy that all of my CAD on the school computers went down, now I can redesign everything using these over winter break) |
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Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
Curious about what kind of lead time/cut off you will have for international orders. Will you be able to ship to Aus before kickoff? If so when is the cut off date.
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Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
Can one of you comment on how much assembly is required for the ball shifter upon receipt of it?
-Brando |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
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- Sunny G. |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
THANKS for this awesome resource! I have tears of joy in my eyes....
Students - let this be a lesson in business applications of engineering - Both VEX (IFI) and AndyMark are fantastic companies serving an exploding market. Your challenge is to figure out what is next and build your own excellent company. |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
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The main ball shift shaft, which contains the two ball shift gears, shift engagement balls, retaining ring, and shifting axle is all preassembled. The customer has to assemble the cluster shaft and two gears on the cluster shaft, insert the ball shift shaft with 2 bearings, and assemble the housings and motors. Additionally, the user has to assemble the 2 standoffs for the shifer and the pneumatic cylinder. If the user wants to use encoders, then that hardware must be assembled too. The user does not have to deal with the ball shift mechanism as that will be pre-assembled. Paul |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
Paul,
Would it be possible to buy just the shifter shaft and all the associated hardware without the two gears? We would love to do the ball shifting but would prefer different gear ratios and would just machine our own gears most likely from your other gear options. |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
I have a simple question, only necessary because our computer lab is closed and I don't have any CAD software on my classroom PC... (Not for lack of trying, mind...):
How wide are the mecanum wheels with/without hubs on them? We're in the process of upgrading our octocanum drive platform and are wondering how much redesign would be necessary for these wheels/hubs. Thanks! Patrick |
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We're going to be posting individual part drawings with key dimensions in the coming weeks (we posted the STEP files to help people get started). The Mecanum wheels are both about 2.3" wide. The widest point is roller-roller. -John |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
Are the screws for the VersaHubs included the the purchase? Or do we have to buy those separately?
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Either way, you need to machine the Gates part, so pick your poison. |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
Yeah, a 5mm pitch, 15mm wide GT2 pulley (say 30 tooth? something big enough to have a 1.125 bore and VersaKeys) that was injection molded out of glass-filled nylon would be a fantastic addition. See what you've done to me VexPro...now all I want is more!
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I also just wanted to say, nice work! You can tell that the whole line has room for expansion, and the available products, well, are irresistible! Great job guys, you will be a major player this year, and I expect to see VexPro items on all winning robots ;) |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
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http://www.vexrobotics.com/vex/produ...rews-8-32.html Every VEX Robotics Design System screw is 8-32. |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
I was interested in the mecanum wheels for a personal project and was wondering what type of rubber is used for the rollers as well as the hardness. Is it a material someone can commonly find and use to cast a mold?
Thanks! |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
Love the new product lines, especially the VersaPlanetary Gearboxes! Do these gearboxes require any grease/lubricant, and if so, is it already applied to the gearbox when we receive it? I didn't see this mentioned in the product description, so I wanted to be sure.
Many thanks and much success on this new venture! |
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Shoot me a PM or contact our sales team directly and we can work with you. Best, Ricky |
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Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
About the VersaWheels:
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There has been a lot of talk on these forums about the interaction between tread shape and the carpet. Given the weight and cost, I would love to use these. |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
I'm having problems with the .STEP file for the VersaWheel. It opens fine, except I keep getting the error telling me to 'check entities'. I'm using Solidworks 2013 on Windows 7 (run via Bootcamp on a Macbook). Everything else worked perfectly except the wheel. Is anyone else having this problem? If someone has successfully converted the .STEP file to a .sldprt file, I'd like to see if I can open that without error, since I haven't gotten far enough to the point where I can save as a .sldprt file.
Thanks! |
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What pressure is it designed to have if used with the 3/4" bore pancake pneumatic pistons?
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Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
Still wondering on how the Roughtop/Wedgetops will attach to these wheels..? I suppose it's a drill and rivet thing for now. :(
- Sunny G. |
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-Brando |
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The method I used: 1. Assemble the wheel. 2. Cut the tread to length. 3. Hold the tread in place with a few zip ties or a belt. 4. Drill holes through the ends of the tread through the wheel rim using a small pilot bit. 5. Fasten the tread to the wheel using rivets, or self-tapping plastic screws. 6. Remove the zip-ties. I am experimenting with some self-tapping screws that work REALLY well. While I would personally use the VEXpro traction tires, we will make sure there will be good options available for those who want to use their own tread. -John |
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Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
Just want to add in my excitement for this! Being from an electrical background I'm obviously more excited about the Jag's and Victor 888's, but still very awesome!
Thanks Vex and IFI!!! |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
I am really excited to see the supply of gears available. There isn't anyone that I know of with such a large range of gears for the prices they have.
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Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
Wow, this is mind blowing.
Huge thanks to IFI & Vex. On another note, what say you all about the Mecanum wheels on VexPro? Significantly cheaper, so I'm wondering there's any tradeoff or if this is just a godsend. |
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"If we go with that price, will people think they're crappy? Should we just price them higher and make sure that people understand the quality level we're going for?" We decided to go with the low price and hope that the community will understand that just because they're inexpensive, doesn't mean they're cheap. -John |
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Well, that's just phenomenal! We're a second year team with a tight budget but were giving a strong look at using mecanums this season (barring any circumstances that would make it a bad choice in the game this year) but the pricetag of over $400 was hefty one. Glad to see some great quality wheels at an even greater quality price - can't wait to get our hands on some! |
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I think others and you have fleshed out most of the ideas behind this, but I do still have a few questions about longevity of the mecanum wheels. Are the rollers molded directly to the axle? What material is that axle? I expect it will be able to handle normal driving conditions just fine but what about after 3 or 4 competitions...can rollers be replaced? More importantly, can an axle be replaced if it is bent? The body and spokes of the wheel does not concern me at all. We've had bent and bound rollers before but they were easily replaced. Thanks for all the information you and the rest of the VexPro team are providing on these products!! Kev |
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I've been updated on this -- though this was our original intent, it proved cost prohibitive to do this. The hexes and VersaKeys will NOT be consistently aligned. -John |
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![]() (Picture is of a gear being used on one side of a wheel, versakey on the other, just in case the photo gets removed/updated to reflect changes) Would you replace one of the hex hubs with a bearing hubs and then rely on the gear's hex and VersaKeys to transmit Torque? |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
Do you plan on releasing different sizes and widths for the VersaWheels?
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Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
When will the CAD model of the Single Speed, single reduction transmissions be available?
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http://www.vexrobotics.com/vexpro/wh...on-wheels.html |
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-John |
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Turns out a 1/2" hex bearing on the other side to pilot is more cost effective than another hub anyways.
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Our reasoning for relaxing the requirement was that since the full torque load could be taken by one hub, then a hex bearing can be used on the other side if you are worried about deflection. As it turns out, the bearing solution is less expensive for the customer anyway. Paul |
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A few people asked about whether we would sell the shifter shafts independently. The answer is "yes" and they're already live on the site (linked from the kit contents section of the Ball Shifter page).
Short Output Shaft (w/ gears) -- as used in the 3-stage gearbox. http://www.vexrobotics.com/vexpro/ge.../217-2793.html Without gears... just the shaft: http://www.vexrobotics.com/vexpro/ge.../217-2791.html Long Output Shaft (w/ gears) -- as used in the 2-stage gearbox. http://www.vexrobotics.com/vexpro/ge.../217-2792.html Without gears... just the shaft: http://www.vexrobotics.com/vexpro/ge.../217-2790.html -John |
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Bumping this post/question...
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![]() Sincerely, Andy Baker |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
JVN or Paul, can you explain how the VersaPlanetary motor connectors work? I've looked through the CAD and I see the set screw, the collar type thing with the slit and the place that it goes. My real question, "is the setscrew the only thing keeping the motor engaged?" I do like the access holes for the setscrew, and that you can swap motors with out removing the gearbox from the robot.
I'm excited to get VEXpro parts in. |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
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The axle is 5mm #45 steel. If you check out the CAD model, you can see how the axle is supported much further out than you might expect due to some creative design of the cast aluminum roller support; the bending moment on these axles is greatly reduced. We experimented with this geometry when designing the Mecanum Wheels for the VEX Robotics Design System, and liked it so much we carried it forward to the VEXpro line. The rollers will be made from rubber co-molded onto a plastic shell. The shaft is knurled on each end and press-fit into two of these plastic shells. We will offer a replacement roller-assembly pack which includes some TBD quantity of roller-axle-bracket assemblies. Yes, we expect it to handle 3-4 competitions "no problem." Yes, we will provide a mechanism to replace the rollers if you want fresh ones. Does that answer your question somewhat? I will have quantitative load ratings for you sometime in the coming weeks. -John |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
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For our gearboxes with aluminum gears, the teflon infused ceramic coating greatly increases the wear resistance of the gears. That said, teams should probably apply a light coating of white lithium grease to ensure longevity. We know many of you will want to be able to use these items for many years, and this will help make that possible. The VersaPlanetary gearboxes use high-strength hardened steel gears. At this time, we are not planning to grease the gears before shipping. -John |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
John,
With the addition of all these great new gearing options, is it possible you might want to make a newer version of your "JVN-DesignCalc.xls" that is defaulted with the "Ball Shifter" specs? I know I can work with the current version by dropping in the numbers, but having the default already have the basics in there would make things even better, IMHO. |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
Hey, I have a quick inquiry about the Mecanum wheels..
I read on the description that they're optimized for the FRC carpet. This is good and all, but how do they fare on other surfaces, like concrete? We like to demo our robots in the courtyard of our school, which is concrete. I'm just concerned that the rubber rollers may not fare too well, and I'd love to know before I put in my order. Thanks! |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
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Allen, The motor connection that the VP uses is one of the more counter intuitive engineered items I have come across in my time as an engineer. This technology is used on industrial robotic gear boxes all over the world and is becoming the common adapter for high rigidity, low backlash applications. There are two basic principles at work: (1) The motor pilot is not used, but the shaft is actually used as the pilot. (2) The set screw really isn't used as normal set screw (clamping on a rigid shaft). It is used as a clamping lever to squeeze the C-coupling into an ellipse. The C-coupler (collar type thing with the slit) and the input collar (the thing the C-coupler fits into are precision machined for an exact slight clearance. In addition, you use a specific C-coupler based on the motor shaft diameter. There is a different coupler for 3mm, 1/8", 1/8" with knurl, and 5mm shafts all with the same OD so they fit in the input collar. The clamping screw is tightened (don't really need that much tightening torque) and turns the C-coupler into an ellipse which locks it in place with no backlash. I have accidentally hand tightened a coupler before and it still locks solid. It took me over 9 months of rigorous testing when I was at FANUC to approve this technology for use on our robots, but after the testing I was sold. easy for replacing bad motors, easy for replacing the gear sets, and no more press fitting gears on motor shafts. Now for high end motors like industrial robots use, this next benefit really isn't a benefit, but for some of the less expensive, non-high tolerance motors we use in FRC, I have found that this next benefit is really helpful: Since you do not have to completely clamp the motor face to the VP mounting face, any shaft runnout misalignment between the motor shaft and motor mounting face is completely mitigated by just hand tightening the mounting motor plate mounting screws. Since the screws only act to keep the motor case from spinning, they only need a little loctite and hand tightening. We will have detailed diagrams on how this all works prior to kickoff. Paul |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
Was the question of belt sprockets w/ VersaHubs already addressed? We want to use belts this year, how would this work with VersaHubs?
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Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
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With a lathe you could bore out a pulley to fit over one of the versahub bosses and put a bolt pattern in it if you just have access to manual machines. |
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Consider my questions answered! Thanks for all the detailed information. I did pick around the CAD file a little bit, but I wasn't quite sure what all was what. Now I just have to convince the team that mecanums aren't as bad as everyone says they are (you'd think our track record with them would be enough...but no) :D |
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Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
Wheel bearings are not press fits. They are light transition fits, where if the bearing is at its largest and the wheel is at its smallest you may have to press it in by hand.
The tolerances are such that the worst case is a 0.0005" interference. The way the plastic geometry is designed will allow even this interference case to be hand pressed. |
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(And it works fine without a fancy spherical-race bearing, because the runout is so small?) |
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Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
JVN & team:
For the ball shifter, the recommended Grayhill 63R encoders seem to be a bit expensive, about $65 or so. The US Digital encoders are half that. Why is the Grayhill encoder recommended? If we choose the US Digital encoder, do you expect it to be 'easy' to mount to the shifter? Concerning the 2-stage ball shifter with long output shaft, am I correct in assuming a (1/2") hex bearing might be needed to support the far end of the shaft, and that it is not included? Thanks, Don |
Re: VEX Robotics Relaunches VEXpro Product Line with over 120 New & Improved Products
One of the first things I thought.....hmmmm seems a lot like apple's video's!
Amazing products though, and awesome prices, it'll really be interesting this year to see what teams decide to build or buy. I think they'll be some tough choices! |
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We have provided mounting in the kit for both encoders. We don't prefer one or the other, but of the myriad of Grayhill encoders, that model is the one we recommend. If you look on the shifter page you can see we have CAD files posted showing the shifter with each encoder type mounted (one CAD model with Grayhill, one with US Digital). Concerning the long output shaft on the 3-stage: It depends on the loading application. What do you intend? That shaft is double supported by 1/2" bearings, so many applications would not require additional support. -John |
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Thanks for the other responses John, that's really helpful information. |
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