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As awerby said, it may be lost steps, however if it's happening consistently when changing to an op with a twist drill, your problem is most likely that the column is not perpendicular to the x and y...

Having a waterjet is game changing, that's awesome. I use Solidworks for all my modelling and simulation. I know fusion has simulation as well, but to be honest I can't stand doing any CAD design in...

Cool build, I've never seen someone build their electronics into the column!

I ran a quick simulation of your connecting bar. At 4000lbs of force, a connecting bar as you have modeled (assumed...

Wow 150VDC @ 3000rpm is pretty crazy, that's servo territory!



That's interesting information to know. Seems like a liability "rule" on their part. I've never heard of modern day steppers...

That's what I figured as well. The gecko website words it in a fashion that makes it seem like the 32 sqrt rule should never be exceeded - although I know of many who have exceeded it.
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I have 900oz-in (3.3mH inductance) nema 34's on my mill being driven by KL8060 drivers and a 48V regulated power supply. I can reliably rapid at 200ipm without any lost steps or issues but I've...

I would recommend copper or aluminum wiring simply because silver or gold can get quite expensive with no worthwhile benefit for our application.

32005 X/Q BRG and 32007 X. They are available here in Canada through motion industries. I'll be ordering some for my spindle once I get my belt modifications done.
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Ahhh gotcha, didn't quite catch that! I agree though, with the upgraded motor and a finer pitch thread it should be a massive improvement.

Which bearings are you running? SKF sells a set of tapered roller bearings that are rated to 11,000 and 14,000 rpm bottom/top respectively - they are more pricey at $40 a piece.

I'm finally...

Your answer of 400lbs lifting force is correct, but it's also not... You're calculating this force from the motor's maximum rated holding torque. I'm not sure where you got the ball screw "spec sheet...

I would be very interested in hearing what the repeatability of those proximity switches. I have a set of cheaper prox. sensors from automation direct on my machine and I've found the repeatability...

I assume you are not using TTS holders? If you wanted to make the face of your spindle flat just throw a lathe tool in your vise and take a couple thou facing cut off the spindle nose.

The attachments unfortunately don't work for me but i'm eager to see what you came up with. I've been thinking about building an 80/20 + polycarbonate enclosure with bi-fold doors for my PM25 for...

Been pulling my hair out for a while trying to figure out what the cause was. It seems obvious now how not checking the column squareness can create issues but in the moment you don't think about it....

Sucess! Thank you cyclestart for bringing that alignment issue to my attention. I had to shim the column nearly 20 thou and was able to get 0.0005" perpendicularity to my table over 8 inches of...

Interesting. I never thought about this alignment and I will definitely check - I can for sure see this being the issue. (I've shimmed for the column tilting forward/back but never side to side)
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I'm curious how you deal with tramming the head in the y-direction to eliminate nod now that the column is bolted in place? Shim between the head stock and the Z-axis saddle? I don't doubt your...

Trammed the head right before the part shown above was machined.
I definitely could have bored it and likely will do so for the following parts, however, I'd like to know that I can reliably throw...

I'm not loosing any steps. It seems the drilling op is the one that is off, but I should measure the spotting op to see if that is off. The drilled holes are always off some amount in the X+ and Y+...

I have a PM25 that I converted over the summer. I've been having issues drilling holes - more specifically they are never centered. I've attached some pictures of a recent part and you can see all...