Greetings all;
The ender5 plus uses a double shafted nema 17 motor mounted on the
nominal center of a 20x20 alu extrusion used for a top/rear frame rail.
So that motor is in the middle of a 21" hunk of alu extrusion
Its coupled to the ends on the x axis via 10" 8mm rods running from each
end of the motor, out to the side rails where it passes thru an 8mm
bearing to turn a 16 or so tooth timing pulley on each end that in turn
moves both ends of the x carriage.
There is no doubt a small amount of twist of that rail, and in the two
10" 8mm steel rods between the motor and the belt pulleys.
Putting a bigger, faster motor with a closed loop encoder takes away one
of the motors dual shafts. So the rod must be made a lot longer, and
exhibit more end to end twist, effecting the synchronicity of the x axis
movement if the motor is moved to one end of this rod and coupled to it
by a short timing belt.
I have, if I don't mess them up, two spares of the 20x20 carbon fiber
tubes. Assuming the motor is moved to the left or right corner of the
frame where its mount would be considerably more rigid, and the long 8mm
steel rod is lengthened to reach, a distance of 21.5 inches, OR 19" of
it replaced by this cf tubing with the 8mm shafting fitted into plugs in
the end of the tubing. Would the tubing twist less than 21.5" of 8mm steel?
It seems to me that 19" of 20x20 square tunbing would have less twist
per NM of applied torque than the same length of 8mm steel shaft, but
IDK. Hence the question.
Thans everybody.
Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/>
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
