pic: 816's 2011 Off-Season Teaser

[thefro526]

loading photo ...

[MattC9]

Are they gripper parts? It looks like a pulley with a hex broach and something else with a hex broach

[Andrew Schreiber]

Originally Posted by MattC9

Are they gripper parts? It looks like a pulley with a hex broach and something else with a hex broach

That's no pulley! (I cannot confirm or deny that I am watching star wars)

I assume I'm ineligible for this...

[Nick Lawrence]

A little hint to stir the crowd;























It does cool stuff.

-Nick

[sithmonkey13]

Originally Posted by Nick Lawrence

It does cool stuff.

-Nick

Isn't anything robotics related cool?

[AdamHeard]

A double sprocket before the teeth are hobbed, and the cylinder is likely a wheel hub to be press/cast into a plastic wheel.

[thefro526]

Originally Posted by AdamHeard

A double sprocket before the teeth are hobbed, and the cylinder is likely a wheel hub to be press/cast into a plastic wheel.

Dang it.

You're right, though I hoped that it'd take a little longer to figure out.

The part on the left is a blank for a 22T double sprocket, made from 7075 Aluminum. It's been broached before the sprocket cutting to make things a little easier for the mill operator.

The part on the right is a 'plug' for a 2" wide colson wheel, made from 6061 AL. Preliminary testing shows that the press is good to at least 80 foot-pounds of torque.

(I'll have to bug you on FB for a shipping address once the stickers are made.)

[rcmolloy]

Originally Posted by thefro526

The part on the right is a 'plug' for a 2" wide colson wheel, made from 6061 AL.

Oh I see where you're going with this one Dustin. The topic that we were discussing about makes sense then.

Originally Posted by thefro526

(I'll have to bug you on FB for a shipping address once the stickers are made.)

...Or just give them to me for hand delivery dude. We don't live that far away.

[Andrew Schreiber]

Originally Posted by rcmolloy

Oh I see where you're going with this one Dustin. The topic that we were discussing about makes sense then.



...Or just give them to me for hand delivery dude. We don't live that far away.

If you guys can wait until Madera I can hand deliver them as long as they go next to the "Powered by..." sticker on your bot

[roystur44]

Drain plug to keep the water out and a small anchor???

[rsisk]

Originally Posted by Andrew Schreiber

If you guys can wait until Madera I can hand deliver them as long as they go next to the "Powered by..." sticker on your bot

Why do I get the feeling there is going to be a heck of a good time had at Madera?

[Brandon Holley]

Originally Posted by thefro526

The part on the right is a 'plug' for a 2" wide colson wheel, made from 6061 AL. Preliminary testing shows that the press is good to at least 80 foot-pounds of torque.

I've been making a variation of the press-fit Colson hub since 05 using the same principle. If I'm seeing the hub correctly, it looks like its knurled which is something I've had great success with as well.

Looking good.

-Brando

[AdamHeard]

For season I see the resources used to make the double sprockets better used elsewhere, and instead just purchase off the shelf sprockets.

[thefro526]

Originally Posted by rcmolloy

Oh I see where you're going with this one Dustin. The topic that we were discussing about makes sense then.



...Or just give them to me for hand delivery dude. We don't live that far away.

Hehehehe. I don't know if you're fully aware of how ridiculous our current project is.

Originally Posted by Brandon Holley

I've been making a variation of the press-fit Colson hub since 05 using the same principle. If I'm seeing the hub correctly, it looks like its knurled which is something I've had great success with as well.

Looking good.

-Brando

Brando, Technically the hubs aren't knurled. The grooving that is visible in the picture was done by running a tool at a relatively high rate across each plug. Technically, it's not the right way to create a strong press because the cuts are in the same direction as the wheels would see force but I'm very happy with the results so we'll probably just stick with this method since it's easy for our Lathe guy to knock out - and it's pretty easy to replicate in house with minimal skill/effort.

Originally Posted by AdamHeard

For season I see the resources used to make the double sprockets better used elsewhere, and instead just purchase off the shelf sprockets.

Adam, you're right on the money with this. I doubt we'll do a run of double sprockets again unless they're absolutely needed or it makes sense to do so.

This entire project is heavily influenced by a few factors:

-We wanted to try some new construction methods.
-We wanted to build a lighter more competitive drive than what we used in 2008.
-We wanted to move to an 'assembly' style build method.
-The shop foreman at our machine shop told me to design something 'interesting' for his guys to make - one thing lead to another and yeah....

Here are some more pictures for those of you that are interested:

[Brandon Holley]

Originally Posted by thefro526

Brando, Technically the hubs aren't knurled. The grooving that is visible in the picture was done by running a tool at a relatively high rate across each plug. Technically, it's not the right way to create a strong press because the cuts are in the same direction as the wheels would see force but I'm very happy with the results so we'll probably just stick with this method since it's easy for our Lathe guy to knock out - and it's pretty easy to replicate in house with minimal skill/effort.

Ah- yes the mental picture popped into place. Knurling is really REALLY simple (and pretty cool). It could be something you guys experiment with now, especially since you already have the lathe, etc.

The gearbox plate looks good. I assume bearings will be pressed into it. I'd be curious to see what results you get as far as the tolerance on the press fit from a waterjet. We've had access to a waterjet for a while, and we use it for a lot of things. One thing I've always been wary about is bearing holes though. We usually will cut out almost the entire part and then go back to correct the bearing holes with a secondary process.

-Brando