WCP: 2017 Product Launch + MCC 2017

[Cory]

Originally Posted by Monochron

Could you explain how a preload prevents ratcheting? Is a preload just applying some small torque on the pulley shaft?

preload=tension on the belt when system is at rest.

[Travis Covington]

Originally Posted by R.C.

Nailed it!

Ours are slightly different and include a counterbore to accept a portion of the shoulder bolts shoulder to eliminate the shear/bending force on the threads themselves (where the cross section is smaller and there is an inherent stress concentration in the thread itself). This means the thread/screw is primarily resisting the axial load and does not have to withstand the full shearing force of external loads.



I should note that all of these additions are awesome and we have already ordered a handful of the new stuff to evaluate and likely use this season. Awesome work to RC and all the WCP folks. It's good stuff!

[HD]

Originally Posted by nuclearnerd

I have heard that GT2 belts are built stronger than HTD belts (especially in Gates Carbon), but can you confirm? Are 9mm wide GT2 belts capable of carrying drivetrain loads, when we've only been able to use 15mm HTD belts safely before? If so, could this be a path for West Coast chasses with fixed axles / no tensioners?

5mm GT2 are marginally stronger than 5mm HTD, but note that these sprockets are 3mm GT2. They will not be suitable for drivetrain loads.

9mm wide GT2 (5mm) is VERY borderline for an FRC drivetrain, as it's only rated to around .8 HP at typical WCD high gear wheel rpms (1000+rpm)(with common 24T pulleys). 2 CIM gearbox can output peak ~.9HP. You would need to step up to at least 26T pulleys to meet this requirement with 9mm belts.

[AdamHeard]

Originally Posted by HD

5mm GT2 are marginally stronger than 5mm HTD, but note that these sprockets are 3mm GT2. They will not be suitable for drivetrain loads.

9mm wide GT2 (5mm) is VERY borderline for an FRC drivetrain, as it's only rated to around .8 HP at typical WCD high gear wheel rpms (1000+rpm)(with common 24T pulleys). 2 CIM gearbox can output peak ~.9HP. You would need to step up to at least 26T pulleys to meet this requirement with 9mm belts.

I don't think anyone is recommending the 3mm GT2 for primary drive train loads (they are however final for initial reduction in drives).

We've used them a good deal on intakes, shooters, initial drive reductions, etc... with great success.

[HD]

Originally Posted by AdamHeard

I don't think anyone is recommending the 3mm GT2 for primary drive train loads (they are however final for initial reduction in drives)

The post I quoted and the other follow up reply seemed to pretty specifically be asking about HTD vs. GT2 vs. GT3 in in a tradional WCD style application. Wasn't sure they realized these are 3mm.

[mman1506]

I know I say this every year but now with even more of your own products you should really consider stocking them in the VEX Ontario warehouse. Shipping times are obviously crucial in FRC and I think the high density of "high performance" teams in Ontario would be well suited to your products. I can recall a couple of times were a product offered by WCP would of been a better solution but we chose something else due to convenience.

[cad321]

Originally Posted by mman1506

I know I say this every year but now with even more of your own products you should really consider stocking them in the VEX Ontario warehouse.

In addition to expidited shipping times, it would help reduce costs aswell. I'm not sure if it's just a glitch right now, but when I went to buy a few of the polycord rollers and a few feet (I assume it's sold by the foot at $0.75) of poly cord, the shipping came out to $140us to ship economy to ontario .

[Tsukunea]

I always re-assemble the gearboxes we look into buying in Solidworks, and that includes the new flipped DS. Was wondering though why there is a 44t gear with a 1/2 hex bore on a 3/8" shaft (See attached screenshot)?

[R.C.]

Originally Posted by cad321

In addition to expidited shipping times, it would help reduce costs aswell. I'm not sure if it's just a glitch right now, but when I went to buy a few of the polycord rollers and a few feet (I assume it's sold by the foot at $0.75) of poly cord, the shipping came out to $140us to ship economy to ontario .

Let me check on the polycord issue.

[R.C.]

Originally Posted by Tsukunea

I always re-assemble the gearboxes we look into buying in Solidworks, and that includes the new flipped DS. Was wondering though why there is a 44t gear with a 1/2 hex bore on a 3/8" shaft (See attached screenshot)?

That guy gets an adapter. Currently there isn't a 44t 3/8 hex gear. There will be one soon

[Cothron Theiss]

Deleted because apparently I can't read.

[R.C.]

Originally Posted by cad321

In addition to expidited shipping times, it would help reduce costs aswell. I'm not sure if it's just a glitch right now, but when I went to buy a few of the polycord rollers and a few feet (I assume it's sold by the foot at $0.75) of poly cord, the shipping came out to $140us to ship economy to ontario .

Try that now, it should work. Thanks for pointing that out.

[Tangert]

R.C. Is there an encoder mount on the 2 Cim Flipped gearbox?

[R.C.]

Originally Posted by Tangert

R.C. Is there an encoder mount on the 2 Cim Flipped gearbox?

Tangert,

We recommend shoving a shaft based encoder into the back of the output shaft:

https://puu.sh/taxeL/234e7a2eca.png

We will have a manual showing how to mount:

-WCP Dual Output Encoder
-CTRE Mag Encoder

We will also include a 3d print file for anyone who wants a mount. I should have the manual up and ready by Thursday/Friday. Working on getting the roller examples and stuff up now.

Thanks!

[Tangert]

Thanks,. Good job on these new products.