A message from REV Robotics

[FTC5110]

Mmmmm.... nice one!
Gearbox (8mm Hex)

Available via AndyMark?

[Greg Needel]

Originally Posted by FTC5110

Mmmmm.... nice one!
Gearbox (8mm Hex)

Available via AndyMark?

They are not available yet, but will be available at either AndyMark and/or our new Amazon store front when it launches.

If international teams need parts we are also willing to work directly with you to find the most cost effective way of delivering them.

[marshall]

Originally Posted by Greg Needel

If international teams need parts we are also willing to work directly with you to find the most cost effective way of delivering them.

I have only one question: African or European swallows?

[orangemoore]

Originally Posted by Greg Needel

They are not available yet, but will be available at either AndyMark and/or our new Amazon store front when it launches.

If international teams need parts we are also willing to work directly with you to find the most cost effective way of delivering them.

Do you have any idea when the CAD models will be up on the site?

[Greg Needel]

Originally Posted by orangemoore

Do you have any idea when the CAD models will be up on the site?

All of the CAD for the brackets are up now, we have not put all of the 3d for sprockets and gears up yet, but will before they are available. If there is a specific model you are looking for please let me know.

[orangemoore]

Originally Posted by Greg Needel

All of the CAD for the brackets are up now, we have not put all of the 3d for sprockets and gears up yet, but will before they are available. If there is a specific model you are looking for please let me know.

The CAD model I am looking for the most is the: REV 15mm – Linear Motion Kit.

[cadandcookies]

I wish I had used some of your products before, but I guess I'll have to now. The business ethos you expressed in that video is definitely something I can get behind. Here's hoping you guys down in Texas can continue to make great products for a long time!

[Greg Needel]

Originally Posted by orangemoore

The CAD model I am looking for the most is the: REV 15mm – Linear Motion Kit.

I just posted the CAD for the linear motion parts and an example assembly, enjoy!

[orangemoore]

Originally Posted by Greg Needel

I just posted the CAD for the linear motion parts and an example assembly, enjoy!

Thanks! now I can get modeling.

[MattRain]

Originally Posted by Greg Needel

I just posted the CAD for the linear motion parts and an example assembly, enjoy!

Awesome. Thank you! We saw the 15mm bars at Worlds, and love them. Looks like we will be using them in this years game! Time to download the CAD and get building!

[FTC5110]

Originally Posted by Greg Needel

They are not available yet, but will be available at either AndyMark and/or our new Amazon store front when it launches.

If international teams need parts we are also willing to work directly with you to find the most cost effective way of delivering them.

Excellent and glad to hear you're thinking beyond the US.

But wait just a sec. 8mm hex doesn't seem to be very common. Were you planning on releasing any 8mm hubs because without them I'm afraid there's little purpose for an 8mm hex output shaft. The plastic gear kits look interesting but to be honest without being able to couple metal sprockets and gears to the motor it's pretty limiting.
Shame it's not 0.375" hex because that's off the shelf already https://www.servocity.com/html/hex_b...ping_hubs.html
http://www.andymark.com/product-p/am-2231a.htm

[Greg Needel]

Originally Posted by FTC5110

Excellent and glad to hear you're thinking beyond the US.

But wait just a sec. 8mm hex doesn't seem to be very common. Were you planning on releasing any 8mm hubs because without them I'm afraid there's little purpose for an 8mm hex output shaft. The plastic gear kits look interesting but to be honest without being able to couple metal sprockets and gears to the motor it's pretty limiting.
Shame it's not 0.375" hex because that's off the shelf already https://www.servocity.com/html/hex_b...ping_hubs.html
http://www.andymark.com/product-p/am-2231a.htm

The decision to go with 8mm hex was actually a long and complex one. I am happy to share our thinking.

• Metric parts - thinking about the system we thought about it from a global perspective, and while some parts may be a bit less convenient for standard teams/countries it is far more accessible than teams metric base countries.

• Resolution of 3D printers - even with the lowest price 3D printer you can print the 8mm hex hole with enough accuracy to make functional parts. This would have been possible with 3/8 or 1/2 also.

• Compatibility with existing parts - Most teams that compete in FTC use and have Tetrix parts. All Tetrix wheels and gears have an 8mm round hole in them and then you use adapters to connect them to either 6mm (motors) or 4.7mm shafts. Since an 8mm round shaft will pilot inside an 8mm hex it makes it easy for teams to use their existing adapters, shafts, gears, and wheels in conjunction with our system. Additionally if teams want, they can get an 8mm hex broach and convert their old parts without a problem.

• Sleeve adapters - most of the motors that are already in the hands of teams have a 6mm output shaft. One of the products we will be offering is a metal sleeve adapter that goes from 6mm D to 8mm hex, allowing teams to convert their existing motors

• Common stock - 8mm hex is a common size in both aluminum and steel in most places around the world.
  

We know that it won't be perfect for everyone, but we did our best to try and consider that the majority of existing teams re-use their parts every year, and we didn't want to force anyone into another closed system. For new teams we will have many adapters and hubs available (either for sale or download) to help make using any existing parts work. Our system will stand on it's own where we will have everything that a team will need but we also make it a priority to play nice with others


Greg

[Richard Wallace]

Originally Posted by Greg Needel

The decision to go with 8mm hex was actually a long and complex one. I am happy to share our thinking.

• Compatibility with existing parts - Most teams that compete in FTC use and have Tetrix parts. All Tetrix wheels and gears have an 8mm round hole in them and then you use adapters to connect them to either 6mm (motors) or 4.7mm shafts. Since an 8mm round shaft will pilot inside an 8mm hex it makes it easy for teams to use their existing adapters, shafts, gears, and wheels in conjunction with our system. Additionally if teams want, they can get an 8mm hex broach and convert their old parts without a problem.

Greg

I don't see the detailed specs for REV's 8mm hex -- maybe I have not looked hard enough yet?

Anyway, a quick search indicates that 5/16" (0.3135" finished dimension) hex broaches are available from popular distributors MSC Direct and McMaster-Carr at about one-third the price of an 8mm (0.3154" finished dimension) hex broach. About $130 for 5/16" vs. about $400 for 8mm.

What is the actual size of REV's 8mm hex shaft? Will 5/16" work?

[jman4747]

Originally Posted by Richard Wallace

I don't see the detailed specs for REV's 8mm hex -- maybe I have not looked hard enough yet?

Anyway, a quick search indicates that 5/16" (0.3135" finished dimension) hex broaches are available from popular distributors MSC Direct and McMaster-Carr at about one-third the price of an 8mm (0.3154" finished dimension) hex broach. About $130 for 5/16" vs. about $400 for 8mm.

What is the actual size of REV's 8mm hex shaft? Will 5/16" work?

Aluminum 8mm hex shaft on MMC has a tolerance of +/- .23mm. That would be .3059in - .3240in. Steel 8mm hex has a tolerance of -0.05mm. Thus 8 - 7.95mm or in inches that's .315 - .313.

[Richard Wallace]

Originally Posted by jman4747

Aluminum 8mm hex shaft on MMC has a tolerance of +/- .23mm. That would be .3059in - .3240in. Steel 8mm hex has a tolerance of -0.05mm. Thus 8 - 7.95mm or in inches that's .315 - .313.

Yes. So if REV gets their 8mm hex shaft stock from MMC it will not fit in a hole made using a 5/16" broach.

However, MMC is not the only source for hex shaft stock -- for example, FRC teams generally have a much easier time fitting hex shafts into broached holes if they buy their shaft stock from VEXPro.

So again, what is the actual size of REV's 8mm hex shaft?