Posted by Ron on June 06, 2005 at 02:09:21:
In Reply to: Re: What could be causing our hob machine vibrations? posted by Bill S on June 06, 2005 at 01:20:04:
Thanks Bill but no we don't have hydraulic feed. I tried something new over the weekend but it did'nt help; I thought that if the machine was developing harmonics then a dampner needs to be added some where. So I placed paper between the work support and blank as well as the table. This gave the blank a dull sound when tapping it rather than the "bell" type of ring it was giving before adding the paper. I'm sure some of you already know this trick. An interesting point to remember, I thought, if trying to hob a blank which has a poor set up/support arrangement. Someone was telling me another thing is to use cast iron, rather than steel, for a work support. Needless to say this particular set up, on the weekend, was supported 5mm short of the root diameter by a heavy walled steel tube 50mm wall thickness and the blank was direct clamped to the table.....the machine still vibrated.
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