Cutting a motor commutator & motor tweaks

[Robbob]

:shock::shock::shock::shock::shock::shock::shock::shock:

Id try pulling that huge shim stack out and see where the bit lines up then go small amounts up from there. Get the bit to just clear the top edge of the wedge block closest to it.

 

[EddieO]

I believe you have the the wrong bit. If you were reading an old Big Jim post on hobbytalk, that was pre 2003......which was the xmod 1 and 2 lathe, which had the bit on the other side....the 3, which is what you have, its completely opposite......It's been years since I messed with one...but I think you may of ordered the incorrect bits.

You definetly cannot swap the block around......I doubt the guides will go over that far...

I'll see if I can find one in the shop, I think I had one....

The other thing, these lathes were famous for being machined incorrectly. Integy QC isn't the best in the biz.....

Later EddieO

 

[Destroyer]

I believe you have the the wrong bit. If you were reading an old Big Jim post on hobbytalk, that was pre 2003......which was the xmod 1 and 2 lathe, which had the bit on the other side....the 3, which is what you have, its completely opposite......It's been years since I messed with one...but I think you may of ordered the incorrect bits.

Later EddieO

The post I found was from 2005, here is the quote I referenced:
"So if I were ordering tool bits for my Integy Xipp, I would want an AL4 bit #3367A131."

I will remove the shim and try again with the stock bit just to be sure.

 

[JohnRobHolmes]

I can get it where the bit hits the v-block but I thought the tip was supposed to be just above the centerline?

When the cutting is being done in the opposite direction. The way your are cutting it is considered below the centerline. Waaay below the centerline.

Bring that bit down until it almost hits the v Blocks.

 

[Destroyer]

Just tried it with new and old bits just skimming the blocks. Still very loud, got so rough it started causing the belt to slip. It's almost like it's not taking off any material. I make the pass then bring it back and it's still rubbing the comm.

 

[Robbob]

Just tried it with new and old bits just skimming the blocks. Still very loud, got so rough it started causing the belt to slip. It's almost like it's not taking off any material. I make the pass then bring it back and it's still rubbing the comm.

what direction is your slave spinning the arm? is the comm going top down towards bit or bottom up against the bit?


clockwise or counter clockwise to this picture?

 

[Destroyer]

It spins counter clockwise in the pic, bottom up into the bit.

 

[Rig Rocker]

It spins counter clockwise in the pic, bottom up into the bit.

It's running backwards so its "rubbin" the com, not "cuttin" :shock:

 

[JohnRobHolmes]

It's running backwards so its "rubbin" the com, not "cuttin" :shock:

Sure about that?

 

[Speedracer19]

I think you have the bit turned wrong.
The slanted edge of the bit should(The bit top as you have it now) be toward the stack & the bit(Cutting edge) should be to the comm end side.
Rotate the bit so the cutting edge is up & down not side to side.

 

[JohnRobHolmes]

His motor is running "backwards", thus the bit is upside down.

 

[EeePee]

I said "Wow!" out loud!

Get the bit to just clear the top edge of the wedge block closest to it.

The block looks like it's even clearanced for the bit to just barely pass over it and then it looks like you'll be good on height.

And find another comm to try out, the one in the pictures is done, and will likely never get cut right, and possibly just hurt your new bits.

 

[losiking1]

Also try moving your bit in the holder. Looks like it may be out too far also.

 

[TEDROCKZ]

If the pic above has the Arm turning CCW (up to the bit)he needs for the bit to be raised slightly ABOVE center line. Not below...He has a right hand feed this is a left but same principal on blade settings

 

[EeePee]

Also try moving your bit in the holder. Looks like it may be out too far also.

Good eye.

 

[losiking1]

Had a Thursday night motor ritual before going brushless in our buggy racing we do. Offroad buggies indoor oval racing on concrete. Would cut 3 motors every Thursday night for many many years. Kinda miss the tuning till i broke out the dyno to check my new 35t Tekins for the XR10. (Still love my lcc btw!!!)"thumbsup"

 

[Manning]

speedracer got it. Your bit height is good, but the new bit isn't right.

The new bit is 90 degrees off. Actually you need a right hand bit which is semi rare since lathes generally cut to the left. Both bits you have are left hand. I might have my "hands" mixed up. I think you would be better off going back to the old bit.

Got to Harbor Freight and get a 1/4" lathe bit set, there are both left and right hand bits in the set. You need a bit that "points" the other direction. Or find an old machinist that can resharpen your old bit.

The picture JRH posted needs to be flipped upside down to match what our motor lathes do.

I run my lathe off of 3 old Nicad cells and a motor that has a 27t arm in a mod can with zero timing.

 

[losiking1]

Run mine off my Tekin dyno set at 3.5 volts. Smooooth!!! Eee Pee, if you like cutting comms, you'll need to get a dyno. No end to how many beers to consume!!

 

[TEDROCKZ]

speedracer got it. Your bit height is good, but the new bit isn't right.

The new bit is 90 degrees off. Actually you need a right hand bit which is semi rare since lathes generally cut to the left. Both bits you have are left hand. I might have my "hands" mixed up. I think you would be better off going back to the old bit.

Got to Harbor Freight and get a 1/4" lathe bit set, there are both left and right hand bits in the set. You need a bit that "points" the other direction. Or find an old machinist that can resharpen your old bit.

The picture JRH posted needs to be flipped upside down to match what our motor lathes do.

I run my lathe off of 3 old Nicad cells and a motor that has a 27t arm in a mod can with zero timing.

Differences...
Lefty

Righty

Also I been using the modded PC power supply on the 3v leg to power mine. 27t motors"thumbsup"

 

[TEDROCKZ]

Went back some and looked. He has all left cutters. The pic of it on the lathe is a little tricky...