Hmm. Belting is a pretty interesting idea. Though for my application, the
reverse motion of a crank/slider isn't a big negative.
I've also been toying with combining a few servos smaller servos to get
the work done. I've got no great idea on that yet mechanically or
electrically. But taking advantage of the maximum torque vs rated torque
on a 750w drive times 2 or 3 would seem to get me into the appropriate
numbers and the smaller drives are much easier to find in single phase.
Dave
On Wed, 11 Apr 2018 22:19:24 -0400, Dave Cole <linuxcncro...@gmail.com>
wrote:
Consider using a timing belt drive. Not exactly a timing belt, but a
cogged tooth belt. They make cogged tooth belting specifically for
linear actuators.
You can buy it several inches wide so 6 hp would not be a problem. I
did a servo drive setup to propel a machine carriage with such a belt.
I think the belt was about 2 inches wide. I think we used a 2 kw servo
motor with a gearbox. It could produce about a thousand of pounds of
pull. You can buy the belting by the meter or foot. I think it is
"AT" belting that is generally used for linear drives. Belts tend to
be a bit elastic when pulled hard so you may need a 3+ inch wide belt.
But it can certainly move quickly. The cost for the belting is quite
reasonable.
On 4/11/2018 3:21 PM, John Kasunich wrote:
On Wed, Apr 11, 2018, at 3:08 PM, John Kasunich wrote:
On Wed, Apr 11, 2018, at 10:30 AM, David Berndt wrote:
I'm looking to output about 1000lbf in a linear direction via a
crank/slider or ballscrew
You don't mention the stroke length. Are you moving a few inches in a
fraction of a second, or several meters over several seconds?
On further thought...
Ballscrew requires unreasonably high RPM.
Crank is very non-linear, and has major problems as stroke exceeds a
couple inches - longer stroke means longer crank which means more and
more torque is required. You never use more than a half-revolution of
the crank, so some serious reduction will be needed between motor and
crank.
Have you considered roller chain? Keep the sprocket size small so the
torque doesn't get crazy high, but you can use multiple revolutions of
the sprocket to cover an unlimited stroke. Still going to require a
gearbox; for a 1000 lbf load you will need a few thousand in-lbs (few
hundred ft-lbs) of torque, which is a LOT for any motor.
Interesting engineering problem to be sure.
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
