On 17.07.18 12:00, Gene Heskett wrote:
> On Tuesday 17 July 2018 10:00:36 andy pugh wrote:
> I'm much more familiar with something like lb/ft, how do I translate that
> into what I am currently tightening the er20 nut to?, which I'd estimate
> at 50+ lb/ft. So mentally I can't compare that to 80Nm.
$ units
You have: 80 N m
You want: ft lb force
* 59.004972
/ 0.016947724
It may be hard to mentally convert, but your mechanical muscle comparison
matches exceedingly well. (50+ vs 59)
> > If the disc is 100mm radius then it needs an axis force of 800N, or
> > 80kg. If the ballscrew on the axis is 5mm pitch then that implies a
> > motor torque of 0.6Nm. So even a relatively small stepper can do it.
The motor, then:
You have: 0.6 N m
You want: oz force in
* 84.96716
/ 0.011769253
You probably have a stepper with more than 85 OzIn of torque within reach.
> That disc I'd estimate was no more than 50mm radius, doubling the
> required motor power. With less than 5.5" of Y motion available due to
> the Y drive conversion design limiting how far forward it can move, I'd
> be hard put to come up with a working 70mm radius for a 185 or 190
> degree turn.
That'd need at least a 120 OzIn stepper, or something like the other
link at the end of the comments. It doesn't have to take the nut off,
but could just loosen the one collet, using a separate motor, stepper or
DC. I think I'd like to make the tool magazine linear, along the back of
the table, so as not to eat up table space. If the nut motor were
reversed for odd tool slots, then there's be no need for an idler gear
between slots.
Erik
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