Works silly well - better than I would have imagined. With the Arduino/Anaheim Automation stepper/driver combo I can step down less than a mil using microstepping - what the toggle switches set - see the vids on that page -
Solid as all hell too.... I can ramp into a cut and it stays at the depth I want. With large cutters it's the typical "small mill - big cutter" vibe (you can see a bit of it on the DRO that reads down to 0.0002 [DRO PRO mag thing]) but it just plows thru - even on mild steel.
Even with the extended solid column -
I did the 2" solid column mod and sent the pics to LMS - they now sell a 2" riser block like what I made.
The thing is just solid... well, as solid as a little mill can be. And I use it a lot for my day job, doing silly I should never even try on a mill that size.
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On 7/25/2017 5:42 PM, Chris Albertson albertson.chris@... [7x12minilathe] wrote:
How does the side mounted ball screw work? I'd be worried about the
torque trying to turn the milling head.
The design I like better places the screw on center line and almost
touching the existing rack. The head's weight is basically hung off the
stationary screw. The screw does not turn. A motor is used to rotate the
nut. I think the overall design is simpler.
People are getting better than .001" with this kind of setup.
Searching around I find a photo of this design here. It lifts from the
center of mass. Disadvantage is you need a full height ceiling but likely
a non-issue for most.
hossmachine.info/images....JPG
<(Medium).JPG>
Allthat said. I have a simple DRO mounted to the z-axis and it is accurate
to .001 and reads to .0005 if I use the gib lock if there is any depth
movement it does the DRO is not detecting it so I amuse not movement over
.0005" and this is with a stock mill, I'm not done with the CNC conversion.
On Tue, Jul 25, 2017 at 8:01 AM, WAM ajawam2@... [7x12minilathe] <
7x12minilathe@...> wrote:
I bagged that whole rack-pinion thing for something a bit more robust:
Actually my wife wanted it changed. She used it when we first got it,
said it sucks, and suggested the stepper I did, or something like this:
I can send the 3D model of that if you'd like...Uses off the shelf gears
from Boston Gear. Uses the same CNC Fusion ball screw.
I've been using the stepper/Arduino thing for years and really like it.
I can get accurate depths that hold.
As to the stock mini mill setup, everyone states you should lock the
gibs, or tighten them up. Also you can check your rack-pinion mesh and
shim the rack to make it a bit more tight.
I didn't like any of those suggestions. A rack-pinion is great for a
drill press; not so much for a mill, at least in my opinion...
//
On 7/25/2017 10:12 AM, 'Johannes' johannes@... [7x12minilathe]
wrote:
20adjuster%20LMS%204700%20Mil
l.JPG?dl=0
This is the fine-adjuster to LMS 4700 Mill.
Have somebody made a lock for this?
My adjuster is moving (turning) when I am milling, and before I am doing
something stupid, I want an advice from you.
Best regards
Johannes
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