[chukkie]

Got some timing pulleys and belts from sdp-si.com and modified for my X2 main drive and they work very well.

Super quiet
4250 RPM in high
Use stock gear change for high/low – I don’t hear the internal gears

[cjdavis618]

That is a great idea. Others would greatly benefit in your work, could you post your part numbers?

[sansbury]

Chukkie,

Fantastic!

Hate to ask, but does your spindle get hot when you run this at top speed?

[chukkie]

The spindle will get hot after running about 10 minutes or so at 4250 rpm's.

I will post the part numbers after I hunt them down.

[Vogavt]

I'm interested in this as well. I'd be happy to help with some sort of diagram if you'd share you're information.

Thanks in advance,

Vogavt

[chukkie]

The parts I used

A 6R 3-031037
A 6A 3-20DF03708
A 6A 3-15DF03708

I used a lathe to modify these pulleys and used the stock gears for reference.
Also had to take a little off the inside of the top black housing – you can see in pic.
Also cut the flanges off the 15 grove pulley.

[Vogavt]

used the lathe to modify these pulleys and used the stock gears for reference.

I'm assuming you're talking about the outer diameters, but can you be more specific as to what modifications you made?

had to take a little off the inside of the top black housing

Are you talking about the shiny area between the gears?

Last question: How did you manage to get the correct belt tension between them? I've looked at mine and only see a limited amout of adjustment. Maybe I'm overlooking something obvious.

Thanks in advance,
Vogavt

[chukkie]

I'm assuming you're talking about the outer diameters, but can you be more specific as to what modifications you made?


Are you talking about the shiny area between the gears?

Last question: How did you manage to get the correct belt tension between them? I've looked at mine and only see a limited amout of adjustment. Maybe I'm overlooking something obvious.

Thanks in advance,
Vogavt

The drive pullet I bored out the hole, added a keyway, turned the sides till the flanges fell off, cut the hub off made a spacer and dished out one side of the pulley to center the pulley up.

The other pulley I did the same thing accept left the flanges on.

Yes the shiny area between the gears

On my X2 there was plenty of adjustment for the belt.

Also had to reverse the motor wires to get it to turn clockwise.

[Vogavt]

Also had to reverse the motor wires to get it to turn clockwise.

Hmmm... begs the question of why did you have to reverse the spindle direction. Mine runs CW anyway so I'm not sure how this mod makes that change.

Confused....

[chukkie]

Hmmm... begs the question of why did you have to reverse the spindle direction. Mine runs CW anyway so I'm not sure how this mod makes that change.

Confused....

When you have 2 gears one turns in one direction and the other turns in the opposite direction.

When you have 2 pulleys and a belt they both turn in the same direction.

[Vogavt]

:withstupi

Didn't think about that. I'll have to pay closer attention when I finally get my C11 board in and try to wire this all up.

Thanks for clearing that up!

Vogavt

[The Blight]

Don't know about your X2, but there were 2 gear transmissions in my mill. One is right under the black cover, the other is inside the head (high low gearing). So it still doesn't make sense. Unless you have just switched out the gears under the cover, and is still using the internal high low gears. I have a belt drive kit installed on my mill, and I have never had to revese the direction of the motor.

Took another good look at the picture you posted. You are still using the internal gears on your mill. That answers that question. I would like a pulley transmission like this if it bypassed the plastic gears inside the head. Don't know if there is enough space for that.

[Crevice Reamer]

Kudos chukkie! Nicely done!

CR.

[Vogavt]

He's removed the original gears and replaced them with smaller gears that no longer mesh. Now he's using a belt to transfer the kinetic energy from the spindle motor's gear to the quill's gear, which must now turn in the same direction.

Originally the quill rotated CW only because the Spindle motor turned CCW. In order for the quill to continue to turn CW, the Spindle motor must do likewise under this setup.

[chukkie]

The whole point I did this was to keep the stock internal gears for fast changing of high/low, more rpm and to make it quieter.

Also no big pulleys on top. - Looks stock

[chukkie]

This was my first attempt with brass gears I made.

Man was it loud !!!!!!!!

My 4th axis is another X2 spindle head mounted to the mill table.

[The Blight]

Voqav: got it after looking at the picture. Forgot about reading the text :P Sorry about that one. Is really all the noise comming from the first set og gears?

[chukkie]

Voqav: got it after looking at the picture. Forgot about reading the text :P Sorry about that one. Is really all the noise comming from the first set og gears?

yes all that noise is comming from the first set of gears

[Vogavt]

Well chukkie you'll be happy to know I've got the set ordered. I also got an extra belt too and it all cost me just under $35.00 (including S&H).

Can't wait to get it switched out!

Thanks for sharing the information.

Vogavt

[chukkie]

Good, I hope it works out for you as well as it has for me.