Rayh,
the whole gauntry acts as a swivel :-}
It's all made of aluminium sheet 15 mm thick, 30 cm wide and 70 cm
height with two 80x80 beams of 122 cm long. If I remove one of the ball
screws I can move that side a few centimeters without applying too much
force.
I thought of adding a timing belt like Dennis mentioned but was afraid
there is too much elasticity in such a long belt (when using two motors).
When switching on the power supply to the motors both stepper motors
will switch to a full step so one motor may move clockwise while the
other goes ccw, one full step means 5 mm (pitch of ball screw) / 200
(steps/rev) = 0.025 mm difference. This does not seem too much so maybe
I should not worry too much about this and just measure the difference
between both sides from time to time.
There never is a problem during operation of the machine - at least not
after setting up the stepper timing correctly.
Meanwhile I decided to leave it as it is, there are enough tother things
I have to do before the machine is 'finished' - unless of course someone
has a complete canned solution that I could use.
My next machine will most likely use just one motor with a belt drive to
two ball screws but I have to look at the specs for the timing belts
first to see if this will give me the accuracy wanted.
Regards,
Rob
[EMAIL PROTECTED] wrote:
Hi Rob
I've been curious about these dual drive axes for quite a while now.
There are several possible mechanical lashups with something like
this. It seems to me that in order to allow separate homing of each
drive, there would have to be a swivel on one side or the other of the
mechanical slide. Is that the case with your machine?
Rayh
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