Hi,
I have a Bridgeport Series 1 2HP mill running Mach3 as a replacement to the old Anilam Crusader. The functionality is unbelievable, and so far the mill has been running Monday to Friday on various jobs. However I've a newly discovered issue:
On spiral drilling or pocketing out a 25mm deep hole (in mild steel) to say 28mm diameter. The bottom half of the hole is out by about 0.30 to 0.40mm, essentially giving me a tapered hole. I'm trying to figure out if this a software or mechanical issue. So far I'm leaning towards the latter. Could the quill bushes be worn inside the headstock? The quill in total is having to extend 50mm down as I have a 25mm clearance due to fixtures. Maximum Z travel distance between limit switches is about 3-4", so 50mm shouldn't be asking to much. Either way, could the increased leverage on the quill at depth cause this issue?
If so how can I go about fixing it?
Is there anything else I should check?
Thanks