Posted by Reiska on August 08, 2017 at 01:11:47:
In Reply to: Re: How to change hob during hobbing process? posted by Frank on August 07, 2017 at 22:57:30:
Thanks for the replys.
Yes, the cutters were coated after sharpening. They were sharpened using automatic/CNC sharpening machine. As said, there wasn't problem before sharpening,but now the cutters bite material much easier, so I think the tooth surface is more prone to get craters if there's something wrong.
I'm having an old Pfauter RS 400 hobber, which didn't have a "flywheel". I though, some slack in machine and for some reason unstable machine run would cause the slack problem to come up with sharpened cutters, so I built a flywheel to make the run smoother. It perhaps helped a little.
What I've seen, the problem does not exist with all cutters that bad. And I always run the final cuts using a small depth for the last cut to make the surface smoother, so the cut depth for the last cut should not be the issue either. And as said, I didn't have the problem that bad with dull cutters. Unfortunately, I don't have Ash Catalog available.
Ok, yeah, chancing the hob might be possible in that case, if all the dimensions in hob are equal to each other. As otherwise I've seen that if workpiece rotates a little between the cuts (e.g., it's attachment is loose or so), it's very very hard to get the workpiece aligned back to original position to continue cutting from same slot. I could say, it's impossible.
I've been making gears couple of years in Finland.
Thanks for the replies again.
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