Originally Posted by bicycleboy  Hi Roberto,
Looks like your having fun! Great work and great pictures. I noticed the same issue with the bolts, see: http://www.cnczone.com/forums/showth...324#post271324
Did you re-tap the holes deeper? Some of mine are only about 3/8 in deep. Is it possible to drill them deeper and then re-tap without messing them up worse?
You mentioned that the deflection was +/-.005 in x,y and z. What load did you use for that deflection. Also what directions are x,y and z so we are talking about the same thing. I use x for right to left, Y for front to back and z for down to up. Don't know if this is correct for mach3 since I haven't finished adding CNC yet. I think I recall posts about changing the coordinate system between milling and lathe work.
Pushing the mill head for and aft is by far the least stiff direction. I plan on stiffening up the fifth column by bracing it for and aft and attaching it directly to the lathe bed in some fashion. By the way the quadralift locking lever that pinches one of the rods seems to have no effect on my machine.
I'd like to see any pictures you can take of the lathe bearing replacement as I'm sure mine will need that.
regards
Mike |
Hi Mike,
Thanks and yes I am, great stress reliever
The direction I talking about is the same as the machine movement axis. The loads I was using was a static 200lbs. My main goal was to make sure that with additional loads on the swing arm and quill, the larthe head stayed put and no changes happened. So with a changing load on the quill, my test shaft in the lathe head stayed at 0.0000 .
The fifth column brace is still removed and will not be reinstalled until a couple strong backs are installed to make it even stiffer. I going to modify the fifth column big time. Working on a design that gives me the strength, stiffness, and no flexing so the it can move up and down via cnc automatically. More to come on that later ....
Yes, all the bolt hole where retapped and cleaned. I found a couple shallow ones and when investigating, found them packed with stuff and cleaned out really well.
My lathe bearing was in great shape and reused so I have no pics on that. Taking that gearbox apart is rather easy but the very large snap ring that holds the lathe gear in place is only removable when the the top plate is removed exposing a large hole at the top of the lathe head.
I will take more pics of the inside of the lathe unit when I take the swing arm off again for machining. Applied is a great source for the bearings, they have stock on a ever single bearing used on the tri-power (
http://www.applied.com ).
Cheers,
Roberto