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John, I bought that kit because I needed to cut a thread. I've never used the internal tool. I would recommend you look further afield. I have bought a lot of tooling from CTC Tools in Hong Kong. They have some much cheaper options for threading...

Been very interesting watching Tom's video. So what I am seeing is that the only advantage of the scissor style knurling holder over the fixed style that came with my toolpost is that the scissors allow a greater range of diameters. I knurled some 4140 the other day and while it turned out OK...

It also comes in a tube. It lasts for ages so no need for a pot unless you have to.

Having fitted a stepper to a 90:1 rotary table, I found that you can't get much more than 4 rpm out of the average stepper motor. I think a 5:1 timing belt drive with a good microstepping drive would do the trick. My DM542A stepper drive does 25x microstepping on my plasma table under LinuxCNC...

Thats very nice James. When I've polished stuff, I've used wet and dry down to about 1200 grit with some kerosene and finish it off with some Autosol metal polish. Not sure if you get it over there but check the Car Parts shops. (eg. Over here - Repco, Supercheap, Autobarn etc). I've got a...

I've had similar problems with my Seig Mill when it was new. The solution was to tighten every screw connector in the wiring and remove every plugin connector and clean with Inox lubricant which is electrically safe. Its been good as gold since! I still get the ERR if I overload the mill but...

Yeh, it kinda got out of hand. I just hope it all works once I join it all up. It all started becasue I had some spare stepper controllers...

I'm not sure if I'm qualified to join in as I've only ever cut 3 threads in my life! But all of them have been cut with insert tooling. I purchased a set that does both internal and external threading. I have never used the internal tool but can confirm that both tools use the same insert. This...

Johno, thanks for the wrap, I'm glad you got value out of my sketch. One of these days I will move my temp setup into a box. I got a bit distracted after I started to build a plasma table with the left over stepper controllers. 8,000 Hz sounds about right. I have to say since I have been...

Well, I still have not tackled the table yet as life has been a bit busy. I also have been designing the last few parts for the table because this thing will be so heavy, I need to be able to get it on the 330 kg casters I've bought for it to move it round. So I made a mount at the...

Very nice. Did you adopt an existing sketch or change it to suit yourself?

A parallel port breakout board is active low so it is wired that way. Maybe try it that way but I never had to do that with an Arduino and I am not doing it that way with my Mesa 7i76e ethernet controller with LinuxCNC.

Just to clarify, delay(x) stops for x milliseconds. There are 1000 milliseconds in a second but there are 1000000 microseconds in a second. So 1 millisecond = 1000 microseconds. You will sometimes see people using usec for microseconds.

#define (or anything starting with #) is a precompiler directive. The generate no code. So #define step 12 simply means to replace the word step with the value 12 before compiling any code like a global search and replace before compiling. A const on the other hand is actually a...

Well, that was bad luck then...

Try disconnecting the enable wires to the stepper driver totally. In my experience, it is a stepper disable signal and the manual says it should not normally be connected. Been caught myself!

I reckon 5 thou will be fine. If the scale is at an angle, it could read less because the distance traversed is shorter. But when you do some trig, given the short length of your scales, it will be 4/5 of 5/8 of F/all... and thus be less than the accuracy limits of your mill. My scales read to...

It looks very nice! Didn't you buy a BXA tool post? Didn't it come with a knurling tool? Mine had 5 tool holders in a set and one was included.

I suspect that there is a mismatch somewhere that is offsetting the screen output or something. Go back to your ebay listing and study the two links provided. The answer will be somewhere there. One is the library on github and the other is the main page. I can't help you anymore than this...

Mike, there is too much static on this thread. This is where you should be starting. You are not thinking about the problem or your hardware.... and just blindly following suggestions made by others based on your hardware. Did you google the error? Get this correct demo script working first...