Retrofitting a 1986 Maho MH400E

Yesterday I felt more like turning than milling. Switched from the Meehanite to a 50CrMo4 drop I got from the scrappies. The finishing pass was a fresh TMCT090402 insert at 1800rpm, very shallow cut and low feed. The swarf came off as sparks, but it looks pretty.


Ground the mounting boss round on the SK40 tool holder, and then ground in an alignment goove using a cut off disc, before parting it by hand.




My grease press arrived so I filled it with Kluber NBU15 and lubed the angle gears of the MAHO.

I've been thinking about how unenjoyable engraving is at 16mm/min with the MAHO screaming away at 4000rpm. Decided to add yet another project, and ground up an old carbide endmill for a drag engraver bit, and then started making a holder for it.





Mark

No eBay APP ID and/or Cert ID defined in Kunena configuration

RotarySMP wrote: I've been thinking about how unenjoyable engraving is at 16mm/min with the MAHO screaming away at 4000rpm.

I keep looking at this:

(1.2kW, 4750rpm) www.kollmorgen.com/en-us/products/catalo...-selection-guide-uk/
And only 36mm long: www.kollmorgen.com/sites/default/files/p...20%28KBM-43%29_0.pdf

It seems like it would fit nicely around a set of bearings and ER collet mounted in a 40-taper tool.

A lot of work for only 750rpm more, and engraving wouldn't need 1.2kW, wouldn't it be better to go with the little frame size ten, and 20K rpm. You could probably fit the tool inside an ER 32 collet

I have an ER-16 collet chuck with 20mm shaft, and a set of P4 AC bearings stashed away in my future projects treasure trove, waiting to be turned into an engraving spindle. There wasa really good one made on CNCZone years ago, where the maker used the rotor and stator from a BLDC model motor as an itegrated motor/spindle. Not sure whether the is much of a benefit now that the chinese HF spindles are so cheap.

It looks like drag engraving works very well on aluminum. Probabaly can't do a useful depth on steel. At least I won't be thrashing the MAHO at full rpm for hour doing that.
Mark

RotarySMP wrote: A lot of work for only 750rpm more, and engraving wouldn't need 1.2kW, wouldn't it be better to go with the little frame size ten, and 20K rpm. You could probably fit the tool inside an ER 32 collet

Yes, but there isn't one of those on eBay at the moment.

At 60mm dia the KBM(S)-10 is too fat to fit inside anything smaller than a 50 taper, but is fairly short so might still work.

Hello everyone in this forum.
Finally, I got some time for my little Maho 800.
I installed the 5i25 and 7i77 cards, but I'm not happy with the interpolation. I use the EXE900 series and I connected it as in the picture.
what is the possible cause to get the radius at the corners
Greeting

Good to see you making progress.

The corner rounding is not a bug, it is feature of the G64 look ahead being active, with a tool path at high speed but combined with limited acceleration. It would look the same on my MH400E if I ran G0 or G1 with near rapid feed rates, and the default G64. You can switch this off with G61, or adjust the blending tolerance behaviour with G64.

linuxcnc.org/docs/2.6/html/gcode/gcode.html#sec:G64

Mark