Check ENCO TOOLS
http://www.use-enco.com/CGI/INLMK3?PMK0NO=112025

1/2-10 X 6 FT is on sale for $6.99   Nuts are $1.31 each.

I have never had a problem with the things I have bought from this
company.  But keep in mind the stuff is for the occasional user.  If I
was going to use the items in a production inviorment I would consider
buying better quality.  but for prototyping things the price is right.

Denny Esterline wrote:

>>Hardware store threaded rod is not too bad, however, it's threads are not
>>made for moving nuts along, they are designed for binding and locking.
>>
>>
>You
>
>
>>will not be satisfied with the movement you get out of regular threaded
>>rod, it will be jerky and have a lot of backlash.  If this isn't a
>>precision machine, that might be OK.   I've used hardware store threaded
>>rod for stuff before, and been largely dissatisfied with what I got.
>>
>>The ideal thing is an ACME threaded rod, available through McMaster-Carr,
>>ACME threads are designed for driving loads along.  I don't know the cost
>>difference.
>>
>>
>>
>
>I think you'd be more satisfied with the results of hardware store rod if
>you knew the cost of ACME rod. Here's an example I just looked up on the
>Mcmaster web site:
>
>1/4 - 20, 1 start, 6 foot long, P/N 6350K133, cost $111.27 each.
>
>Let's not forget about the nuts:
>P/N 6350K208,  $16.73  each.
>
>Compare that to about $5 for a 6-foot threaded rod, and a nickle for nuts.
>
>I have used hardware store rod on my CNC hot-wire foam cutter. 1/4-20 and
>nema23 motors generate more than 50lbs of push at ~1 inch per second. No
>it's not as good as ACME can produce, but I built my machine for less than
>the cost of one ACME rod.
>
>-Denny
>
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>
>

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