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Thread: Weird belt slippage
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3rd September 2023, 10:30 PM #1
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- Join Date
- Aug 2015
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- 4,458
Weird belt slippage
I was doing some large cuts on the old Hercus 9, boring through 10mm plate with carbide cutters.
Started with a CCMT0602 on a 12mm bar, until the hole was large enough to move up to a 16mm bar:
IMG_4495.jpg
(Yes, I am using an internal threading insert for boring. It is my only 16mm bar, and I have plenty of 16IR inserts, and you can save some time by cutting in both directions - a deep cut toward the chuck, then maybe a gentler .2mm DOC away from the chuck)
I noticed that, when really pushing the larger cuts, the belt would try to twist off the side of the pulley!
IMG_4496.jpg
Experimenting with spindle speed, depth of cut, and feed rate showed that it was only the fastest pulley position (629RPM on my machine) and heaviest feed/DOC that caused it.
Got the job done eventually:
IMG_4497.jpg
(that is a 70mm hole, no coolant)
but am confused as to why the belt was skewing instead of just slipping!
Attached Images
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IMG_4495.jpg (192.1 KB)
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IMG_4496.jpg (145.7 KB)
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IMG_4497.jpg (195.2 KB)
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