RE: [SherlineCNC] Re: Constant Sherline issues..
- I would suggest either a counterbalance or a higher rated motor for the Z
axis. I worked through something similar to this with a friend of mine from
Texas and he added a higher rated motor and it solved the problem.
With the A2Z leadscrews you can get up to 80 ipm rapids.
From: SherlineCNC@yahoogroups.com [mailto:SherlineCNC@yahoogroups.com] On
Behalf Of dnldkempton
Sent: Tuesday, June 30, 2009 12:34 PM
Subject: [SherlineCNC] Re: Constant Sherline issues..
A little background since it's been awhile..
-A2Z upgraded Sherline X/Y/Z axis
-4TPI Kerk leadscrews with anti-backlash nuts
-Still using the Sherline 120oz steppers
-Originally had the Sherline computer running EMC1, and had issues when I
changed the leadscrew parameters.
-Upgraded to EMC2, but seemed like compatibility issues with the Sherline
computer.. used an older computer I had laying around (about the same specs
as the Sherline), and seemed to run better. Noticed the parallel cable
wasn't correctly installed on the driver board (very loose and cocked to one
-After the upgrade, it seemed to work ok, then I got busy at work, and
machining took a backseat.
-I picked up some silica sand locally, and was going to make some lost foam
molds for a robotic project, and designed a part. After the first pass, the
Z axis decided it didn't want to retract fully and the cutter plowed into
the workpiece as the X/Y repositioned. The next try got much further, but
did the same thing.
-The X/Y tables have no problems at all.. only Z axis.
-I have no counterbalance setup for the Z axis as of yet...thought this may
be a problem.
-Manually jogging the Z axis gives no problem at any speed, or any position.
-The last project was set at 8ipm X/Y, 4ipm Z, and 9.5ipm rapids (I entered
all the values doubled, then set the override to 50%)
-I am using Rhinocad 3d and Meshcam
[Non-text portions of this message have been removed]
- Hi Bill,
you are right on.
Two set screws diametrically opposed can alow pivoting.
Two set screws at 90 degrees to each other take up any play in the proper way.
Jerry G (Glickstein)
- In SherlineCNC@yahoogroups.com, William Rutiser <wruyahoo05@...> wrote:
> David Morrow wrote:
> > But, having said tht, I've had the same problem occasionally with my X axis failing to turn. The setscrew seemed ok and I took everything apart and when it all went back together, all was fine.
> > Next time, I think I'll drill and tap another hole in the coupler 180 degrees opposite and use two set screws. It's been a while since I've had mine apart so I'm not positive about accessibility on this.
> > David
> I seem to recall that it is better practice to put the second setscrew
> 90 degrees from the first.