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Old 04-24-2005, 08:12 AM   #1
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I got so pissed at myself last night...

Ordered up some 1/2" Delrin to make a set of transmission/motor plates with. With my limited tooling and skills, I decided to cut all the holes and bearing pockets on the rotary table. Talked with Bill (RCAlloys) and he said he usually grinds down a 1/2" endmill to the diameter he needs. He'd never though about going at bearing pockets like this and was interested in my rotary table idea.

Remember, I'm using manual equipment.

Worked well. I nailed the .190" pocket depth, but I went brain dead and cut the pocket .003" too large in diameter. :-x

So I get to start over and crank handles again today.
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Old 04-24-2005, 03:50 PM   #2
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Man Jason, sounds like you need a boring head...

Your using the rotary table to open up bearing press holes??? Or are you using it to layout a radial hole pattern?
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Old 04-24-2005, 04:48 PM   #3
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Quote:
Originally Posted by Ace
Man Jason, sounds like you need a boring head...

Your using the rotary table to open up bearing press holes??? Or are you using it to layout a radial hole pattern?
That's what I'm wondering. Did you grind an endmill down to match the O.D. of the bearing for a light press fit, or are you using the rotary table with an undersized endmill? Plunging it with an endmill works as long as you pilot drill the hole undersized first close to the finish diameter. Another thing to watch for is runout in the tool.
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Old 04-24-2005, 04:52 PM   #4
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Alright you guys got it, and Bender since you've been doing such a good job, you're the mod of this section
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Old 04-24-2005, 04:56 PM   #5
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Quote:
Originally Posted by jason
Alright you guys got it, and Bender since you've been doing such a good job, you're the mod of this section
Cool, thanks!!
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Old 04-24-2005, 07:36 PM   #6
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Quote:
Originally Posted by BENDER
That's what I'm wondering. Did you grind an endmill down to match the O.D. of the bearing for a light press fit, or are you using the rotary table with an undersized endmill? Plunging it with an endmill works as long as you pilot drill the hole undersized first close to the finish diameter. Another thing to watch for is runout in the tool.
Undersized endmill and rotary table.



It worked, though.

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Old 04-24-2005, 07:46 PM   #7
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I see, I was thinking a smaller diameter bore. Looks nice.
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Old 04-24-2005, 07:48 PM   #8
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Well, I did have a smaller one to cut for the bearing pocket, wasn't too bad though.
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Old 04-24-2005, 07:49 PM   #9
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What kind of material is that you used? Some kind of plastic, it looks like.
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Old 04-24-2005, 08:05 PM   #10
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That's 1/2" Delrin.
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Old 04-24-2005, 08:09 PM   #11
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Where did you find a table that small? It seems to be the perfect size for rc stuff.
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Old 04-24-2005, 08:10 PM   #12
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Jason You making a 2 speed trans?

That's a Sherline table. About 4" dia.
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Old 04-24-2005, 08:20 PM   #13
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Yeah, that's a lil' Sherline rotary table came with the Sherline 4000 lathe and vertical milling column I picked up a couple of years ago.

Ace, the 2-speed is for an idea I've had in my head for a year now. Finally getting started on it.
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Old 04-24-2005, 08:37 PM   #14
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Sweet. Looks like a fast motor? (not for a crawler?)

I'd love to have 2-speed gearbox's in my clod. Have low for crawling, 2nd for wheelspeed.
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Old 04-24-2005, 08:50 PM   #15
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Crap.

Thought I replied to this...must've clicked "Go Advanced" instead.

The motor is a 7 turn Hacker Brushless. The 2-speed is from OFNA and intended for use in the Monster Pirate or Dominator.
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Old 04-24-2005, 10:35 PM   #16
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Quote:
Originally Posted by Ace
I'd love to have 2-speed gearbox's in my clod. Have low for crawling, 2nd for wheelspeed.
You mean one of these 2-speed transmissions?
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Old 04-24-2005, 10:42 PM   #17
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Wow, very nice BultacoJim!! Is that your creation? Is it manually operated?
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Old 04-24-2005, 10:46 PM   #18
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Un-frickin'-believable! You don't by chance have time for an understudy?!
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Old 04-24-2005, 10:50 PM   #19
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You guys aren't making me waiting to get my mill and lathe any easier!
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Old 04-24-2005, 11:03 PM   #20
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Quote:
Originally Posted by BlueMonster
You guys aren't making me waiting to get my mill and lathe any easier!


It'll be worth the wait!!
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