[Eurisko]

Regular acme threaded rod has a lead tolerance of +-.009 in. per foot.

Precision acme threaded rod has a lead tolerance of +-.003 in. per foot.

What size and type of acme rod are YOU using?

What type of drive nut ( brass, delrin, anti-backlash, rotating, etc. )

What is the positioning / repeatability of your machine?

What are the machine dimensions?

[ger21]

Actually, even the cheaper precision is ±.009. Keystone from MSC, which is what I used. The Nook they also sell is ±.003

1/2-8 2 start, with nuts from DumpsterCNC. 30x48 working area, but not yet finished.

[sdantonio]

What size and type of acme rod are YOU using?

Regular acme threaded rod, but looking to switch to 2 start precision.

What type of drive nut ( brass, delrin, anti-backlash, rotating, etc. )

Steel embedded in HDPE (see the "Joe machine" designes. Once I switch to the 2 start I will have to switch to either dumpsters or make my own out of delrin.

What is the positioning / repeatability of your machine?

Don't know, machine is to new. But I did cut 11 identical pieces yesterday and they overlay perfectly (by eye).

What are the machine dimensions?

3ft X 5 ft cutting bed.

[Eurisko]

Thanks for the info, guys.

My experience with acme rod sellers leaves much to be desired.
Ordered (three) ''cnc acme leadscrews' from an Ebay seller.

The package arrived beat-up and open on one end. Amazingly, nothing was missing... except packing material, to keep the rods from banging together, which apparently they did, many times.

I ordered (two) 72 in. 1/2-10 acme rods from Enco. They were shipped in a very sturdy cardboard tube. Great, I thought. This time the rods will be pristine!

I opened the tube, and there were my two rods, dinged and beatup from bumping into each other. Again, no packing material.

I just ordered one Nook 72 in. 1/2 -10 precision acme rod from Reid Supply.
Better price than MSC, $45.00 vs $57.00 (for the same rod).
Wish me luck...

[ger21]

My screws from MSC were loose in a cardboard box full of foam peanuts, but were undamaged.