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  #181   Spotlight this post!  
Unread 12-12-2013, 23:15
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Re: Back for more..VEXpro 2014 Product Unveiling

Some clarification if possible:

The difference between gears with versakey option and those without - does this refer to just the female versakey pattern in each gear? Do the non-versakey gears still come with the bolt pattern?

Also, I see two availability options: "In stock" and "Ships before kickoff". How long would it take each of these to ship if I ordered today?

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Unread 13-12-2013, 00:12
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Re: Back for more..VEXpro 2014 Product Unveiling

Do we have an ETA on documentation for the 3-CIM gearbox? I'm trying to figue our how to mount one to a piece of channel and as far as I can tell the logical thing (using the hexagonal home pattern) won't work with any standard screw cap size. Anyone know how this is supposed to work?

Note: I know I'm going to feel stupid after somebody points out that some specific holes are for mounting it in a way that I should have already thought of.

EDIT: Also, though that tire model works, it looks like it's more of a stand-in than an actual model for the 1/2" segments of Traction Tire that appear on the website. Will the actual traction tire models be released?
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Last edited by cadandcookies : 13-12-2013 at 00:23. Reason: added question instead of posting again
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Unread 13-12-2013, 00:50
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Re: Back for more..VEXpro 2014 Product Unveiling

Will WCP continue to sell colsons in the future? Will Vex be stocking colson wheels at their distribution centers next season?

Apart from the new 3.25" versawheel, are there any plans to make wheels cheaper/easier to interface with 1/2 hex? right now the solution seems to be either two 1/2" hex versahub for @18/wheel, or a 1/2" versahub and a bearing for $14/wheel. 3.25" leaves you with little ground clearance, right now the best options seems to be 4" colsons, with 4" stealth wheels being the cheaper option.

Last edited by AndreaV : 13-12-2013 at 00:58.
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Unread 13-12-2013, 01:45
Travis Schuh Travis Schuh is offline
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Re: Back for more..VEXpro 2014 Product Unveiling

Quote:
Originally Posted by JVN View Post
Hi Sean,
Unfortunately, I don't have a data sheet to back this up. We spoke directly with a few belt manufacturers, off the record on this topic.

Of course those users who would prefer GT2 belts can purchase them from any number of suppliers. VEXpro has chosen HTD based on the feedback we received, and some simple preliminary testing.

If you have any concerns, feel free to email prosupport@vex.com to discuss further.

-John
Quote:
Originally Posted by Jared341 View Post
Given that HTD is at this point a de-facto standard while GT2 is a proprietary profile*, I don't think a lot of belt manufacturers would want to go on the record with an unbiased recommendation. Gates is going to say that GT2 is the way to go, while everyone else will say HTD.

In reality, a wise designer would probably want to have enough of a safety margin that either profile would not ratchet.

* A brief Google search couldn't confirm or deny this, but it is my recollection. I'm sure that CD will correct my statement if it is incorrect
Everything I have seen in the Gates literature showes the GT2 profile ahead of HTD. Check out page 10 of the Gates Light Power and Precision manual. This shows the ratcheting torque of 5mm GT2 and HTD being evenly matched across a range of tensions tested at 2300 RPM (roughly 3X FRC drive train speeds), with GT2 being slightly better than HTD (<5% and decreases as tension increases).

The main advantage as I see it of GT2 over HTD is reduced backlash. In a light load test condition (as defined by Gates), the backlash on 3mm GT2 is 1/3 that of 3mm HTD (.012" vs .030"). This is because the GT2 profile is designed to have less clearance than the HTD profile.

Given the small performance difference as reported by Gates at the 5mm size, the FRC application, and the vendor feedback that Vex Pro got, HTD seems a reasonable choice. I look forward to having more timing belt and pulley sources. We will have to look into it more, but it looks like this offering may enable us to make our wheel modules using all Vex Pro products.

-Travis
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Unread 13-12-2013, 03:46
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Re: Back for more..VEXpro 2014 Product Unveiling

Quote:
Originally Posted by smistthegreat View Post
I'm not sure if this was intended with the design, but you should be able to find a 3-position cylinder to put on the bottom dog, letting you shift the drivetrain into a neutral gear (with the dog disengaged, between the two dog gears) when you want to engage the PTO.
Quote:
Originally Posted by BBray_T1296 View Post
Oh yeah! I just remembered another thread wondering if there was a neutral for the ballshifter, and there was a link to the piston Im sure you are talking about. Thanks
BBray,

The intent of the product was to allow for a neutral IF teams wanted it.

http://puu.sh/5L9Hb/b016fcbd71.jpg

The cylinder mount allows to teams to use the current SMC pancake cylinder along with the Bimba/Fabco 2 position OR 3 position cylinder.

http://puu.sh/5L9I5/005faa9138.jpg

-RC
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  #186   Spotlight this post!  
Unread 13-12-2013, 04:48
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Re: Back for more..VEXpro 2014 Product Unveiling

Quote:
Originally Posted by s_forbes View Post
Some clarification if possible:

The difference between gears with versakey option and those without - does this refer to just the female versakey pattern in each gear? Do the non-versakey gears still come with the bolt pattern?

Also, I see two availability options: "In stock" and "Ships before kickoff". How long would it take each of these to ship if I ordered today?



If you order the one that says, "in stock" then it will ship same day if ordered before 3pm Central time. The "Ships before Kickoff" items are in the plating process right now and they will ship before January 4th.

Yes, the gears without the Versakey pattern still have the FRC standard mounting hole pattern. We made non-Versakey gears to save teams that don't need the Versakeys some money.
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Unread 13-12-2013, 08:44
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Re: Back for more..VEXpro 2014 Product Unveiling

Quote:
Originally Posted by Travis Schuh View Post
Everything I have seen in the Gates literature showes the GT2 profile ahead of HTD. Check out page 10 of the Gates Light Power and Precision manual. This shows the ratcheting torque of 5mm GT2 and HTD being evenly matched across a range of tensions tested at 2300 RPM (roughly 3X FRC drive train speeds), with GT2 being slightly better than HTD (<5% and decreases as tension increases).
That's the literature I found as well. Seems like if backlash isn't a concern, HTD should be fairly interchangeable, but I wouldn't say it is ever better performing than HTD.
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Unread 13-12-2013, 18:56
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Re: Back for more..VEXpro 2014 Product Unveiling

Here's something neat that I'd love to see from VEX: JVN's mechanical calculator as some sort of web app.
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Unread 13-12-2013, 19:01
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Re: Back for more..VEXpro 2014 Product Unveiling

Quote:
Originally Posted by DevenStonow View Post
Here's something neat that I'd love to see from VEX: JVN's mechanical calculator as some sort of web app.
And for the sake of convenience: A belt C-C calculator to help select which VEXPro stocked belts and pulleys to buy, right on the VEXPro website. Not hard to find elsewhere, but it'd be great for people who are new to designing for belts.
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Unread 13-12-2013, 19:04
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Re: Back for more..VEXpro 2014 Product Unveiling

Quote:
Originally Posted by Akash Rastogi View Post
And for the sake of convenience: A belt C-C calculator to help select which VEXPro stocked belts and pulleys to buy, right on the VEXPro website. Not hard to find elsewhere, but it'd be great for people who are new to designing for belts.
Seconded. This would be really, really helpful.
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Unread 13-12-2013, 19:41
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Re: Back for more..VEXpro 2014 Product Unveiling

Quote:
Originally Posted by DampRobot View Post
Seconded. This would be really, really helpful.
Especially considering that the SDP/SI calculator doesn't actually have some of the belts that VexPro does.
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Unread 13-12-2013, 19:47
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Re: Back for more..VEXpro 2014 Product Unveiling

Center distance calc now available here and will be on VEXpro's site soon.

Works for any size pulley, and gives out the two nearest VEXpro belt sizes, to the desired center distance. The pulley size also turns bold when you are using a VEXpro pulley. Any box that is white can be edited by the user, boxes that are gray are info from the calculator.
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Last edited by AlecS : 13-12-2013 at 19:50.
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Unread 13-12-2013, 19:51
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Re: Back for more..VEXpro 2014 Product Unveiling

Quote:
Originally Posted by AlecS View Post
Center distance calc now available here and will be on VEXpro's site soon.

Works for any size pulley, and gives out the two nearest VEXpro belt sizes, to the desired center distance. The pulley size also turns bold when you are using a VEXpro pulley. Any box that is white can be edited by the user, boxes that are gray are info from the calculator.
#TeamAlec

Thanks WCP!
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Unread 13-12-2013, 23:05
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Re: Back for more..VEXpro 2014 Product Unveiling

For all those who want to take a quick look at some of the new components without opeing the CAD, here are a few screenshots:

2 motor VersaPlanetary plates:


CIMile Cuttaway 1:


CIMile Cuttaway 2 (with mega cool output shaft/gear!):


WCD 3 CIM Ball Shifter:


WCD 3 CIM Ball Shifter Cutaway:
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Unread 15-12-2013, 21:12
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Re: Back for more..VEXpro 2014 Product Unveiling

I've been playing around with VersaPlanetary CAD models today, and it has been a learning experience. They're really neat little boxes.

What holds a ring gear add-on stage to the new dual input gearbox? The STEP model shows a couple of 10-32 screws sticking out, but there is no threaded 10-32 hole to go into on the ring gear stage. The 10-32 screw would seem to go into the the cutout corners of the ring gear block. Does the ring gear's shoulder press fit into the plastic housing of the dual input?

This picture shows the 10-32 screws sticking out and not connecting to the ring gear. What have I missed?



I tried rotating the ring gear 90 degrees to use the other holes with 8-32 screws, but it looks like the distance between those 8-32 holes is less than 2", presumably to force people to assemble VersaPlanetary boxes correctly. This picture off the Vex Pro website shows the ring gear in the same orientation as I am trying to assemble it.


Last edited by Nemo : 15-12-2013 at 21:23. Reason: Picture
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