Here's a weird question.
Got these knurls out of a cabinet
I began to wonder if, perhaps, I can use them on my CNC mill, in order
to make knurled surfaces. Just put one (on a toolholder) in a spindle,
put the spindle on brake, and knurl the surface? Anyone tried this?
Not I. Not sure that the spindle can apply sufficient force.
Just hold them to swap into the Turret T knurlers discussed in
another thread. Knurls wear out, and you will need matched pairs for
I think that he was talking about putting a knurl pattern of a
flat surface by moving it under the knurling tool held in the mill's
I don't think that the mill can apply enough force to do this,
As for good *lathe* knurling tools -- my preference is the
Aloris sort of like this:
eBay auction # 370517093202
except that instead of having a shank, it fits directly on a BXA
toolpost. The knob turns a leadscrew with left-hand thread on one end,
and right-hand on the other so the rollers and arms remain centered
above and below the workpiece as you adjust the diameter.
Or -- with the turret, I prefer the 'T' style ones like in
eBay auction # 120738214924
except that mine have a 1" shank to fit my turret without an adaptor.
Guy Lautard's book _The Machinist's Third Bedside Reader_
has a write up on flat knurling.
Do you want to know how to: * fit a backplate to a lathe chuck?
* use an edgefinder to best advantage, and how to "Pick
up" an edge in a hurry?
* hold a gib strip for machining?
* pull a tee in the wall of a pipe?
* get broken taps out of aluminum?
==> * knurl the edge of a rectangular block?
Suppose the axis of the diamond-pattern knurl wheel is parallel to the
lathe's x axis. The teeth of the knurl are at some angle to that axis,
say 35 degrees. If you orient your caliper at 35 degrees when you
measure tooth separation and you measure 0.0344", then along x the
tooth distance is 0.0344/sin(35) ~ 0.060", which apparently is what J.
A. Harvey in
is talking about measuring.
However, in the articles about straight knurls, the pitch used in the
calculations is tooth separation measured along the x-axis, and it
seems to me that's the relevant pitch for diamond knurling too. For
both straight and diamond knurls you can get that number by dividing
(pi*D) by the number of teeth, where D is a diameter of the knurl wheel.
Think about this, the mill has enough force to drill one inch holes.
The servo motor can apply 2.5 ft-lb IIRC, doubled by pulley that
gives 5 ft-lb, applied to 2 inch screw diameter it gives 60 lbs, and applied
to a 10:1 thread it gies 600 lbs. Gotta be plenty.
I ran a job (a tool) for one of my customers that required a straight knurl
in a groove. Using a single coarse roller, I made a holder that was held
in a 3/4" collet and knurled the part (tool steel). Worked fine, but
required several passes. Did it on a Bridgeport mill, in fact.
I expect you'd have similar success with a diamond tool, although you won't
be able to achieve the diamond pattern on a blind piece unless you do it
with single rollers, one at a time.