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What could be causing this finish issue?

Milland

Diamond
Joined
Jul 6, 2006
Location
Hillsboro, New Hampshire
The chatter on the right-hand part? Likely a resonance with that particular thickness and area of aluminum, at that cutter speed and feed. That part section is essentially a diaphragm if it doesn't have any internal reinforcement.
 

1320feet

Aluminum
Joined
Apr 23, 2008
Location
Calgary
I'm not concerned with the chatter as it's not a problem at other speeds. I'm concerned with the lines that are spaced .550" apart. I tried different rpm's and feed rates to eliminate resonance frequency. I'm kind of worried about a lead screw problem. But .550 is larger than the lead of the screw I think. Not sure what the pitch is for a 1998 SV500. Maybe one bad ball?
 

Milland

Diamond
Joined
Jul 6, 2006
Location
Hillsboro, New Hampshire
I presume this is an X move? If you have a really accurate straightedge/parallel, (like a granite Lab Grade artifact), set it level on the table, put a tenth indicator in the spindle, and do a couple traverses along the top of the parallel. You don't care about height changes, you're looking to see if the same ~.550" period is showing up as small movements of the needle.

Then lay the parallel over, align it to X, then do the same move with the indicator reading off the side. If you see movement at the same period it's likely something pushing the table either side to side or up and down as it runs. Dig in further to see what the mechanical issue is.

If there's no sign of mechanical movement, maybe this is a brushed servo and some of the commutator segments are more worn than others, introducing a motor speed variable?

Hopefully others will have better ideas.
 








 
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