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That is very nice! It looks like it'd preclude the use of a belt drive though...Originally Posted by InspirationTool
How hard would it be to make a powered drawbar with a meaty stepper motor?
Holy #$%#$%!!!! Have you all seen this??
http://www.littlemachineshop.com/pro...ProductID=2936
http://www.littlemachineshop.com/pro...ProductID=2937
-Jeff
PS: I searched cnczone to see if anyone mentioned this, and they haven't yet.
That is very nice! It looks like it'd preclude the use of a belt drive though...
How hard would it be to make a powered drawbar with a meaty stepper motor?
According to the PDF, you can use the Sterling belt drive kit with the power drawbar.
thanks for the link, they look great! do you know who manufacturers them?
D'oh - I just looked at the pics oops!
does anyone know roughly how much force the compression spring washers in this produce to hold the tormach collet when running?
CAD drawings only. Why no photos. At what stage of development is it. Is there a running example. How about a video.
Its backordered so who out there has one. On sale as well.
My sceptical nature must be showing by now I guess.
Regards
Phil
Last edited by philbur; 11-15-2006 at 12:58 PM. Reason: Typo, again!
Looks like the power drawbar/tool changer costs more than the mill. Go figure!
Don't forget the $$$$ for the Tormach tool holders. Guess I need a second (or maybe 3rd) job!
Bill
billyjack
Helicopter def. = Bunch of spare parts flying in close formation! USAF 1974 ;>)
well its too expensive for me, but i would like to build something similar.
I hear that! Do you think a stepper might be up to doing the drawbar? I'd rather it were screwed in and out than just pulled back in by a spring...
from the looks of it i would say that the drawbar itself is springloaded and that is a fat air cylinder on top of it.
i have been wanting to build something similar, but i just haven't put down the cash for the tormach tooling yet.. maybe someday, just not today.
I think the main issue is that the driver needs to be disconnected from the draw bar when the spindle is rotating. This is easily done with a spring and air cylinder. It becomes mechanically more complex if you want to - connect to draw-bar, rotate, then disconnect. Of course it is doable but coming up with a simple reliable mechanical system will challenge your design skills.
The down side of the air cylinder/spring arrangement is you need a compressed air supply and, unless you complicate the design, the considerable force require to compress the spring when releasing is taken on the bearings.
I guess you could replace the air cylinder with a stepper motor combined with some kind of a cam/lever arrangement in order to gain the considerable mechanical advantage necessary to compress the spring. But that still leaves the spring.
Regards
Phil
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