Sure did.. no movement at the end of the Y axis, so I assume the preload is on the money. Still .035" backlash....
12551
Fred Smith
imserv1
May 27, 2009 9:00 pm
... Not the preload on the thrust bearings, that affects end play but not backlash. The Kerk lead nut has a preload adjustment that you have to pre-set, before...
12552
dnldkempton
May 28, 2009 1:13 am
The preload on the anti backlash nut is as tight as I could get it. The Z axis came already installed when I recieved it, so it was something I could use for...
12553
Fred Smith
imserv1
May 28, 2009 10:05 pm
... Well, I have an X and a Y axis that I just finished assembling. I set a zero on the hand wheel and a zero on my indicator in contact with a fixed position...
12554
Doug Rundell
rundell_doug
May 28, 2009 10:20 pm
Fred, Shouldn't the test work with motors also? Doug Rundell Billy Bob's Beer, Bait & Tackle 1339 Creekside Ln. Newberg, Oregon 97132 Ph 503-554-0824 ...
12555
dnldkempton
May 29, 2009 1:15 am
I mount a dial indicator in the spindle, and set it against a fixed flat object mounted on the mill table. I set it against the object, and zero the indicator....
12556
Andy M
trumpy81
May 29, 2009 2:55 am
... GDay All, Donald?, forgive me but I believe that you are not measuring backlash, but are in fact measuring your computer/software/controller resolution, if...
12557
dnldkempton
May 29, 2009 2:32 pm
I'm confused then.. If the computer reverses direction of the table, and the stepper turns, thinking my table has moved .0035", and it hasn't..(only taken out...
12558
Martin Dobbins
trainnutz
May 29, 2009 3:23 pm
Don, Andy might be quite right because when you start jogging in very small increments you may get lost steps (depends on the computer, control system and a...
12559
dnldkempton
May 29, 2009 4:07 pm
I hope Andy is correct.. because I am running a test piece right now. Brand new mill bit, snugly adjusted gibs, no flood cooling this time, (just to make sure...
12560
Martin Dobbins
trainnutz
May 29, 2009 4:47 pm
Best of luck, and let us know how the test piece turns out. Martin ... I hope Andy is correct.. because I am running a test piece right now. Brand new mill...
12561
dnldkempton
May 29, 2009 4:53 pm
I had a little crash not related to the previous problems. The rapid movements loosened the Y axis leadscrew coupler.. the motor spun, but no leadscrew...
12562
Kenny Gorman
kgorman_dba
May 29, 2009 5:23 pm
I bought a used 5000 series mill on craigslist just the other day because of the good price. I have a couple of newbie questions. I intend to mill T6061 into...
12563
Alan Marconett
km6vv
May 29, 2009 5:57 pm
Welcome Kenny! The mill should do just fine. You'll want to get a set of endmills, center drills, a set of good drill bits, and a set or two of the stepped...
12564
Hamilton Elliott
ei_ell
May 29, 2009 5:58 pm
Hi Kenny, I would suggest that you pose this question(s) to the main Sherline group rather than this CNC group as it is more active and I notice that this...
12565
dnldkempton
May 29, 2009 6:00 pm
Actually, the crash wasn't what I thought. The Z axis seemed to be acting irregular, like taking deeper and shallower cuts on the same plane. I saw the head...
12566
Rich Dean
cmsteamer
May 29, 2009 6:06 pm
Kenny, an excellent tutorial book is Sherlines "Tabletop Machining". There are several Sherline tool discount resellers (google Sherline). Considering the...
12567
Rich Dean
cmsteamer
May 29, 2009 6:10 pm
Be aware that endmills held in collets will work out under heavy side load. Only an endmill holder with setscrew tightened on a slot in the shank will give...
12568
Alan Marconett
km6vv
May 29, 2009 6:11 pm
What are you using for and endmill holder, or collet? Endmills can be "sucked down" into the stock. Endmills in endmill holders should be positioned such...
12569
dnldkempton
May 29, 2009 6:17 pm
12570
dnldkempton
May 29, 2009 6:35 pm
Endmill holder.. My intuition told me to tighten the endmill down the wrong way apparently. This is the first time I've had this happen. Before, it just pushed...
12571
Fred Smith
imserv1
May 29, 2009 10:47 pm
... Yes, it should, but backlash is a purely mechanical measure. If the software is messed up, it may mislead one into thinking that backlash is present, when...
12572
alenz2002
May 30, 2009 6:58 am
... Doug, Fred was a bit brief in his description and a crucial point may have been missed. Using Fred's method set the hand wheel to zero by approaching it in...
12573
dnldkempton
May 30, 2009 5:04 pm
I appreciate any and all input! Tonight, I was "lucky" enough to see the Z axis fault in action. When nearly completing a test piece in aluminum (the MDF piece...
12574
Chuck
chuck...
May 30, 2009 9:57 pm
That sounds like you are losing steps then the z axis is lifting. When the z does not lift as far as it should because of missing steps, the next time it goes...
12575
Harry Brill Jr.
proaudioguy
May 31, 2009 3:11 am
Don't you have a spare around the house you could use? Seems like I'm always finding another old computer in my garage and putting it by the road. I have...
12576
dnldkempton
May 31, 2009 4:20 am
I believe I have a couple computers laying around here.. I suppose I could cobble one together. The Z axis had just raised itself above the workpiece, and...
12577
dnldkempton
May 31, 2009 4:36 pm
It appears Martin may have had the correct answer from the beginning..all my issues I had previously blamed on myself, mechanical failure, or loose parts seem...
12578
Harry Brill Jr.
proaudioguy
May 31, 2009 4:42 pm
Congratulations. Please keep us informed of your continued success. I am a long way from setting my kit up CNC and I have learned a lot from your posts and...
12579
Martin Dobbins
trainnutz
May 31, 2009 7:18 pm
Don, I'm happy you've found a solution that is working for you (at least on the test pieces). Just remember when you get on to the main job that has caused...
