Re: [CAD_CAM_EDM_DRO] Re: ACME or Ball?

Thomas Fritz wrote:

>ghidera2000 wrote:
>
>
>>I was searching for someplace to purchase BS&A leadscrews and nuts
>>on Yahoo and Google, keep finding reviews and the manufacturers but
>>no-place actually selling them. Anyone have some links? Prefer in
>>Canada but gotta go with whomever has them :D
>>
>>
>
>One place I know, which I can buy over the phone very promptly, but are
>slow with send a price quote through email:
>
>www.roton.com
>
>Their website is nice, as it has probably all the technical data you
>need to use thier products.
>
>I'm not sure, however, about the lead error of their stuff...I think
>they make everything with precision roll-forming, which is less
>expensive than ground ballscrews, but if I remember correctly...no wait,
>I just picked it out of the website:
>
>Lead Error
>The deviation from nominal lead resulting from manufacturing variations.
>Standard lead error tolerances for Ballscrews are .010 in. per foot.
>Lead errors for Acme, Hilead® and Torqspline® series leadscrews are .009
>in. per foot with precision tolerances of .006 and .003 available in
>selected sizes. All tolerances apply plus and minus, however, thread
>rolled product errors are generally the same throughout the entire screw
>and can be easily compensated for with appropriate profiling software.
>
>

BS&A said it was no problem to provide rolled screws for plastic
slider nuts with accuracy of .001"/Ft, and I would assume that would be true
for rolled ballscrews as well. Their machines must be tighter than Roton's,
I guess. It was a modest price premium to go from the .003"/Ft standard
accuracy to the .001"/Ft, and I got a chart showing the actual error
measured
on my screw.

Jon