Recently got a Bison semi-machined 1.5-8 chuck blackplate from MSC. I've found that the threaded bore and spindle register it comes with is _larger_ than that of my lathe. Am I missing something or is this a defect? I was under the impression that semi-machined BPs were supposed to be slightly undersized so they could be finished to match the machine. This one's so loose it wobbles around quite a bit--larger than 1.5" by a bit.
GTO(John)
That's why I only get totally unfinished backplates, and do all the boring and threading myself.
Jon
Thread wires are cheap. Buy a set, learn how to use them, and then measure your spindle thread. It might be undersize. On my SB9, it measures 1.503" which has caused me a bunch of grief.
MSC *will* take it back. If your spindle thread is correct and the backplate is loose then call their customer service.
Grant
GTO69RA4 wrote:
Before I learned to thread I bought large nuts and welded them in a steel
3/4 inch plate and then proceeded to make my own plate. They are still in use now. After welding they actually tightened up a bit and required a little force to install. After several on and offs they now fit like a glove. Note, they did take a "set" about a month later and required a little fine tuning to make it perfect.PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.