pic: 294 teaser

[Rick Wagner]

It's the plywood backing that was used to cut the 3/8 thick aluminum turret plate (a sprocket) on the GKN water jet.

[AdamHeard]

Originally Posted by Rick Wagner

It's the plywood backing that was used to cut the 3/8 thick aluminum turret plate (a sprocket) on the GKN water jet.

The teeth look #25 pitch to me, wouldn't that make the aluminum plate 1/8"?

[s_forbes]

It looks more like a timing belt pulley (a really really big one!) than a chain sprocket, so 3/8" makes sense.

[RyanS]

#25 chain

1/8 aluminum plate sprocket

204 teeth

[Rick Wagner]

Originally Posted by AdamHeard

The teeth look #25 pitch to me, wouldn't that make the aluminum plate 1/8"?

Good catch Adam. You and Ryan are correct. 3/8 would be way too heavy!

[sdcantrell56]

You have us beat. We cut out a 180 tooth 25 series sprocket for our turret. Ours was done with a laser though.

[Rick Wagner]

Originally Posted by sdcantrell56

You have us beat. We cut out a 180 tooth 25 series sprocket for our turret. Ours was done with a laser though.

The real test will be in the crater. See you in Atlanta!

[sdcantrell56]

Indeed. I hope we get to see you guys in Atlanta.

[MrForbes]

You have us beat too. We used a sawzall to cut the center hub and spokes out of a swamp cooler pulley

[unclewaldo]

Originally Posted by akeisic

False, True, True, False

We set a record at the GKN waterjet; the code to make the part was 3700 characters [ed: lines??] long and took nearly 2 hours to cut. The best part is that the part came out perfectly. No need to redesign or remachine here!

AND how to you plan to place the chamfer on the sprocket teeth?? I can think of some interesting solutions but am curious as to your plans...

.... or are you leaving them square and hoping for the best by keeping the chain tension "extra tight" since I assume this will lie in a horizontal plane....

[akeisic]

Originally Posted by unclewaldo

AND how to you plan to place the chamfer on the sprocket teeth?? I can think of some interesting solutions but am curious as to your plans...

GKN's largest lathe can handle 20" diameter parts, which is where we will be doing our work. If it really came down to it we could stick it up on our VTL we use for our 6ft diameter engine nozzles. :-)

[Borisdamole]

Originally Posted by Rick Wagner

Good catch Adam. You and Ryan are correct. 3/8 would be way too heavy!

Well, wouldn't be the first time 294 over engineered something.... lol

(i.e. last years "cheesing" of the upper A-frame)

[EricVicenti]

Very nice. We cut a 183 tooth timing pulley for our turret on a laser cutter out of quarter and eighth acrylic. Works very well.

[Rick Wagner]

Originally Posted by Borisdamole

Well, wouldn't be the first time 294 over engineered something.... lol

(i.e. last years "cheesing" of the upper A-frame)

We made our weight and it never broke! Good luck to the Greybots. See you in LA and Las Vegas.