[davida1234]

Outlawtaz, now I see what you mean, thank you.

First of all, I wouldn't call it a twist, more like a slant or not level. A twist in my mind is something 3D.

Second, we don't know if the 1515 was dead straight. Could be a factor why I had to shim it. Third, the stringers underneath could be a little off, which would create that delta too. Or the simple fact that one Y rail ended up a bit higher than the other one during assembly. You should know that that frame was maybe 8-9 times fully disassembled/re-assembled while doing all the revisions. Looks like I didn't check everything close enough during the last assembly.

I tend to think that I ended up with one Y-rail being a bit higher than the other Y-rail. Particularly through the fact that in the front-to-back-direction, the 1515 didn't need any shims at all (not documented in my post).

IMO, that is an acceptable condition.

The only relevant thing here is that the 1515 was parallel to both the X-rail and the Y-rails. After all, the spindle moves on those rails. Which it was when I shimmed it. Once I install the spoil board, it will be a bit higher on one end than the other relative to the X-rail. Like 0.02" or so. Skimming it will make it parallel to both the X-rail and the Y-rails.

Let's see what else you got!

[Outlawtaz]

First of all, I wouldn't call it a twist, more like a slant or not level. A twist in my mind is something 3D.

Yes, it is a 3D problem. I actually had a customer that cut some insanely small profiles on parts and I went in every six months or less and checked / adjusted the machine. They were quasi threads that were 0.005" wide and 0.003" deep. I used a ballbar tester that measures down to the micron to make very tiny adjustments. Again, well outside the precision that anyone shoots for on a homebuilt

I just haven't seen anyone show their tramming before so it just came to mind. Mostly just curious about your thoughts on it...

Love the videos of power up. Can't wait to see you cut some actual parts on it. Now I'm curious to see feeds and speeds, depth of cut, etc...

[davida1234]

I used a ballbar tester that measures down to the micron to make very tiny adjustments.

0.00004".......

Well, Outlawtaz, yours capabilities are definitely way beyond my capabilities.

As you said, well outside the precision of a homebuilt, let alone some semi-commercial machines.

I do like your different perspectives, though. Keeps me aligned, so to say.

[Outlawtaz]

0.00004".......

Well, Outlawtaz, yours capabilities are definitely way beyond my capabilities.

As you said, well outside the precision of a homebuilt, let alone some semi-commercial machines.

I do like your different perspectives, though. Keeps me aligned, so to say.

Precision test equipment for a precision part. I always liked the challenge that was posed in helping the customer make something dead nuts so to speak. Not to mention that customer did all kinds of R&D and experimental stuff that was really cool to see. The above mentioned part was a friction stir welding stylus the had a rounded triangle (like the rotor in a Mazda rotary engine) at the business end. On the faces of the triangle were the vanes that resembled those tiny threads. He actually deburred these "threads" with an exacto knife and a magnifying glass.

Now that I don't do that work anymore, I have entered the world of home built machines. I kinda keep tabs on what other people are doing, collecting ideas and trying to see how precise a machine can be made without spending tons of money. Just a personal mental exercise I am in the middle of that hopefully will turn into something tangible in the near future