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Its been a while since I updated this thread. There is 2 reasons for that. One is I stuffed up one of the laser cut parts so I had to get it recut before I could make the cradle that holds the slats. And then I found out that Lee had given me the wrong measurement by not allowing for the 5mm...

If you go.to this thread http://www.homemodelenginemachinist.com/showthread.php?t=25091 , the installation is set out step by step. Pretty much any NEMA23 will have enough power to turn a rotary table.provided.if has enough volts. I found 19v was not enough and went to 48v. Most steppers are...

And heavy too! I could lift one end pretty easily before I put the linear rails on. I can just lift one end now but at the end where the gantry is parked, I could not really move it much at all. The rail mounting plates were hard to attach on my own as they are probably about 50 kg each. I...

MIG, I'm afraid, his TIG is mint too! Anyway, to cheer you up, I had a go at him today for putting the one cr@ppy weld on the top of the machine for all to see. Anyway, I put some of it together, and over the weekend, hope to mount up the gantry. I am happy with the clearance between the...

So i've now got a table! And here's why I didn't bother to weld up such a precision weldment.. Nice Work from Lee

I'll give that a bit of thought. THere is not really any side forces as the DB9 cable is held firm where it exits the drag chain.

James, I have this one with a built in CNC port. http://www.everlast-welders.com.au/product/PowerPlasma_50. It has a blowback start. They say the Mesa THCAD can handle HF start. I think HF start might be hard to control noise and may need an earth stake driven through the slab. I think...

Progress has been pretty slow. While I can kinda weld, Lee at work does it for a living so there is no comparison between what I can do and what he can do. Finally, the table is coming together. The jig we are using is one we use to make truck bodies for utes and pickups. To get the...

Looks good Baz, I forget how clean my lathe was before I started to actually use it! Nah, build your own CNC one. I know you want to and so do you!

Looks good. Check the angle of the castings you are bolting to before you decide. Weld some nuts on the tabs and mount on the inside if you can. That will look the nicest and also be easy to install it.

In my first year at university in 1978 when most of us worked in imperial units in everyday life, the lecturer calculated the power output by an engine in SI units and came up with the result in kW. It took half a blackboard. He then redid the same sum in imperial units and came up with the...

Cogsy, I'm on your side. Like you I live in Australia which converted to metric in 1966 with what is acknowledged as being the most successful metrification project ever ran. Like you I am old enough to remember the conversion and being taught how to do maths in imperial units in school. Wow...

I spent quite a few hours with a file and emery paper over several sessions before the 4 jaw chuck bundled with my lathe was as smooth as silk. It may help to apply some engineers blue and look to see where it rubs off to identify tight spots. I don't use it very often but used it today and...

Blighty, if you are in the UK, maybe also look at RS Components I've bought a couple of pulleys from them and they were reasonably priced. T5 is a metric size (5mm pitch). My stepper reduction drives are using a 5M belt which is similar to T5 except the grooves are rounded and are meant to have...

I'd wait until you try it, you might be surprised how much holding torque your stepper motor has.

Blighty, When I did my tests I used a cheap $10 tacho off ebay to measure RPM of an unloaded stepper. You can calculate the RPM and compare with what you measure to see if you are missing steps. Once I hit the limits, I backed off a bit.

Blighty, I will be very surprised if you can get up to 50x microstepping. There are a lot of other timing issues that will impact and limit speed in the real world. In my instance, I have dedicated hardware step generators on a commercial quality external ethernet control card (Mesa 7i76e)...

Open an account with Photobucket and upload your image there and it will have a ready built IMG url you can paste it into you thread and the pic will appear as if by magic.

I would say your collection contains some imperial threads. Here are the metric sizes http://www.metrication.com/engineering/threads.html Most bolts I buy are about 0.2mm undersize. If it were me, I'd toss out anything that was not a metric thread on account of banning imperial tape measures...

No offence taken, your sharp intake is due to the Australia tax that we pay every day for the privilege of living in this country. I may be fortunate as we use metric in this country as it means we only need 60 degree tooling and there is no difference in form between coarse and fine...