CAD CAM EDM DRO - Yahoo Group Archive

RE: [CAD_CAM_EDM_DRO] 60 degreee thread ( hijacked thread

on 2003-05-06 06:37:04 UTC
Thanks Dave,
Now all is completely clear!
Peja

-----Original Message-----
From: turbulatordude [mailto:davemucha@...]
Sent: Tuesday, May 06, 2003 2:02 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] 60 degreee thread ( hijacked thread


--- In CAD_CAM_EDM_DRO@yahoogroups.com, Miroslav Pejic <peja@n...>
wrote:
> Hi group members
> What's 60 degree thread? Isn't this standard screw?
> Short time ago I asked about using this type instead of ball screw
and get
> negative opinions.
> What's now?
> Peja

Yes, 60 degreee thread is standard thread.
yes is is bad
yes it can be used
yes many do use it.

When you push on something with a thread, the angle allows the nut to
climb or expand as not all force is being pushed in the axial plain.

ACME is better as it pushes more force in the Axial
and ballscrews are the best.

we rate these with an efficency. ball screws are better than 80%
effieient, ACME between 40 and 65% and standard 60 thread is around
30-35%.

in other words, if you can move the ballscews underload with a 150 oz-
in stepper, you would need a 450 os-in to use a 60 degreee thread.

Also, if you use standard threaded rod, it is not smooth, but cut so
the threads are even worse. if you buy ground rod so you get smooth
threads you are close to the cost of an ACME.

extensive details are in the archives somewhere.

Dave







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Discussion Thread

ralaco 2003-04-29 17:03:02 UTC Z Axis Lubrication Jon Elson 2003-04-29 21:50:05 UTC Re: [CAD_CAM_EDM_DRO] Z Axis Lubrication ralaco 2003-04-30 10:04:38 UTC Re: Z Axis Lubrication Jon Elson 2003-04-30 11:10:09 UTC Re: [CAD_CAM_EDM_DRO] Re: Z Axis Lubrication Miroslav Pejic 2003-05-06 03:40:15 UTC RE: [CAD_CAM_EDM_DRO] Re: Z Axis Lubrication turbulatordude 2003-05-06 05:01:52 UTC 60 degreee thread ( hijacked thread Miroslav Pejic 2003-05-06 06:37:04 UTC RE: [CAD_CAM_EDM_DRO] 60 degreee thread ( hijacked thread