Thread: Ready Steady Eddy
The led of the switch is a big help.
Honestly I can't be happier that I made my gantry to square via Mach3. When I moved it by hand I was doubtful that is needed. But once it moved 100m then the Hiwin loosened a bit and I see the benefit of squaring with a push of a button.
Like I said before even thou gantrys are built and look strong and they will drive just from one side when pushed etc you will always get some racking to some degree or another. When one motor stops while other keeps moving then the mechanical advantage of the ballscrew even with relatively small steppers attached will twist even very strong gantry's like Boyan's(Silyavski) if this happens you have no way to know unless referenced with marks or switches.!
Been away from the forum for a while and just reread your build. Really good stuff!
Just got myself a small workshop together (mill - lathe on the way) and starting to learn the ropes and having a blast!
The Following User Says Thank You to cncJim For This Useful Post:
Still not got a dust shoe sorted due to not having found the ideal design, maybe this is it ?
I'm going to make it out of wood first to see how it performs, then use perspex.
I wanted it to be adjustable so the bottom of the skirt was flush with the bottom of the cutter, or thereabouts. It's not so handy that my spindle does not have a rounded body and has air exit holes at the bottom for the top mounted fan exhaust. Skirt held on with 3 pairs of magnets, allows easy access and different length skirts to be used, mini, knee length, evening gown.
Any thoughts ?
It's got one of these on the other end;
Last edited by EddyCurrent; 11-11-2014 at 08:02 PM.Spelling mistakes are not intentional, I only seem to see them some time after I've posted
Eddy, if you make it spring/pneumatic loaded, the skirt can be arranged to be always in contact with the media top face. The main disadvantage with dust shoes etc is that you loose sight of the actual machining. G.
Geoffrey, I was going to make it like that, but during some earlier trials, I found on some 3D stuff that if it didn't follow the tool down, then gaps around the bottom would appear in some areas.
Getting tension right might work but I can't see how it could be controlled very well. I was thinking that by some mechanical arrangement, the dust shoe could be made to advance at a slower speed that the tool, say 60%, I'll have to think about that.
Edit: now I've had some mackerel for breakfast thinking has improved. Looking at the pictures in my earlier post, the dust shoe is supported by two rods held in blocks with wing nuts. If those blocks were replaced by a tube with a spring inside this might apply the right pressure. As the tool advances so would the pressure on the springs and the shoe would lower slightly. Adjusters could be made to alter spring tension.
Last edited by EddyCurrent; 12-11-2014 at 11:03 AM.Spelling mistakes are not intentional, I only seem to see them some time after I've posted
He's played with various setups and found that the only way to deal with 3D with any decent success is to have a larger vaccum area and with big bore vacuum. The little vacs couldn't get enough volume over the larger area.!! . . . Basicly you need excess vacuum to blitz the area.
He said Small shop vac was fine for everything but deep 3D work.
Last edited by JAZZCNC; 12-11-2014 at 10:51 AM.
Last edited by EddyCurrent; 12-11-2014 at 11:05 AM.Spelling mistakes are not intentional, I only seem to see them some time after I've posted
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