[kuyote]

Hoss, have you had any issue with your treadmill motor cycling? The one I've put in place comes up to speed pretty good, but shortly after it slows way down, and speeds back up. If I put any kind of side load on it, it goes away. Just wondering what others have down to stop this.

[hoss2006]

No, hadn't had anything like that with the treadmill motor, what controller are you using?
Hoss

[kuyote]

I just installed a kbmm-125 controller.

[hoss2006]

That's what I have, haven't had any trouble with it, how are the brushes in the motor?
Hoss

[CodeRage]

Sounds like the IR and/or CL trim pot needs to be adjusted. Make sure you have the correct HP resistor installed and follow the manual's instructions for calibration. Fully cranking the accel pot can sometimes cause cogging as well.

[kuyote]

Looks like the IR was it, I turned it down a little and everything smoothed out! Thanks CodeRage.

[Potatohead908]

So I bought Hoss's plans for the CNC conversion of the G0704. I have read some are using a tapered bearing for the bottom bearing on the Z axis to give better lateral support. I am using AC bearings for the top and bottom bearing on the Z axis. I'm I doing this wrong? Is there a better option?

[hoss2006]

Don't know who would be using two types of bearings but two AC bearings are proper, there is no need for large lateral support especially if you use direct drive.
The lower bearing doesn't provide much in the way of support anyway as the weight is hanging off the top bearing, the stock mill doesn't even have a lower bearing.
Two AC's are needed for CNC for backlash mitigation.
Hoss

[hoss2006]

Finished up the rear y axis with the new mounts, very pleased.
A little testing then I can move on to other projects.
I still need to make the stair lift to get access to the basement again among others, I cut up a $300 ladder for that project.
Hoss

[Connor]

Finished up the rear y axis with the new mounts, very pleased.
A little testing then I can move on to other projects.
I still need to make the stair lift to get access to the basement again among others, I cut up a $300 ladder for that project.
Hoss

Exactly why did you cut up a $300 ladder.. and what did you use it for ?

[bill south]

Hoss;
What do you use under your stock to boost the material up so that the table is protected? I'm getting ready to build up a tool plate for my Torus and want to raise it slightly to avoid cutting into the table.
Bill

[hoss2006]

Exactly why did you cut up a $300 ladder.. and what did you use it for ?

I didn't use it yet but it'll be for a modified portable roof shingle lift (look it up on youtube) but will have a seat and use a power hoist to move up and down the stairs.
Hoss

[hoss2006]

Hoss;
What do you use under your stock to boost the material up so that the table is protected? I'm getting ready to build up a tool plate for my Torus and want to raise it slightly to avoid cutting into the table.
Bill

Lots of things, spacers cut from thick ally tubing, ally bar stock, 1/4" plastic sheet, the leftovers from cutting out parts from ally plate deburred of course, ally square stock lengths and so on, this is all just temporary sacrificial pieces per job.
If you are raising a tooling plate I'd attach permanent square stock to the underside or at least permanent feet.
Hoss

[bill south]

Thanks Hoss;
I'm thinking permanent feet at the ends and in the middle edges. Do you think 32 inches of 3/4 aluminum, eight inches wide should be rigid enough with just the ends and middle supported? Inquiring minds want to know. Or at least I'd like an opinion. Many thanks in advance.
Bill

[hoss2006]

Something that long I'd probably go 1 inch thick and/or use 4 feet spaced evenly along the length.
Hoss

[pista01]

That's about what I was seeing too. Now that I have several hours on it I'll have to see what it is. The last thing I did was carve out a small 2" mold out of wax using a .002" bit and was not able to see an evidence of backlash. I've been quite happy with the double nut performance.

[hoss2006]

Yeah they are definitely worth the few extra bucks over the single nuts.
Hoss

[pista01]

Yeah they are definitely worth the few extra bucks over the single nuts.
Hoss

There's no point in getting the single nuts at this point. The best part is I used the plans I got from you a year ago and I only needed to adjust the length of the stepper standoffs. They slid right in without any loss of travel or additional modifications, with nothing more than basic hand tools and a dremel. Adding a 1.5kw spindle next.

[Connor]

Yeah they are definitely worth the few extra bucks over the single nuts.
Hoss

I asked before.. not sure I got a clear response. What, if any loss do you have with the Y-Axis? I want to order my double nut screws and was planning on doing the 2" rear extension with a front mount stepper. So, My questions are as follows.

A) Any issue mounting the Front-Mount extended version of the Y-Axis screw WITHOUT the extension.
B) What can we expect our travel to be. (With the 2" extension added)
C) What modifications were needed in the original 2" Extension?
D) Is the 2" extension for the spindle needed ?

My reasons for asking all this is.. I'm not planning on doing the 2" extension right away.. but, I want to go ahead and do everything for it short of adding the extension to the back of the base, and make the tombstone 2" extension for the spindle. (I.E. Add the longer ballscrew)

Thanks, Billy

[Connor]

Dupe