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#1
 
03-25-2007, 10:36 PM
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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?  |
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#2
03-26-2007, 08:14 AM
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| 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.
__________________ Gerry Mach3 2010 Screenset http://home.comcast.net/~cncwoodworker/2010.html (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management) |
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#3
03-26-2007, 08:37 AM
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| 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.
__________________ If you cut it to small you can always nail another piece on the end, but if you cut it to big... then what the hell you gonna do? Steven |
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#4
03-26-2007, 03:35 PM
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| 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... |
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#5
03-26-2007, 05:19 PM
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| My screws from MSC were loose in a cardboard box full of foam peanuts, but were undamaged.
__________________ Gerry Mach3 2010 Screenset http://home.comcast.net/~cncwoodworker/2010.html (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management) |
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