Gallery, Projects and General > Project Logs
Making a Rotary Table
Fergus OMore:
Agreed Matt. Frankly, I have a number of rotary tables- some professionally made and others home made from assorted metals. Only one has ball races and that is on a Clarkson tool and cutter grinder.
It suggests that this idea of needing fancy bearings in model making somewhat 'over engineered'
Regards
Norman
awemawson:
If you recall the pictures of when I was rebuilding that Nikken rotary table unit as a 4th axis for my CNC mill it has rollers for table down force and rollers for side thrust:
http://madmodder.net/index.php/topic,9439.0.html
I suspect though it was built to withstand far higher forces than you will generate with your splendid beast
NormanV:
Yes, I realise now that a PTFE washer in the lower position would be daft, I will use a steel one. I like the idea of using PTFE under the table, I checked on Wikipedia and it gives a yield strength equivalent to 3,300 PSI. It seems unlikely that my usage will get near to that.
Andrew, I think that your rotary table is probably a bit big for my milling machine! I think that I was trying to overengineer it, for my light usage I think plain bushes and washers will do the job.
NormanV:
I have bored the holes for press fitting the bushes for the worm. I had originally planned to bore it by mounting on the tee slotted table on my lathe and boring it with a boring bar between centres. Unfortunately I had nothing to use as packing to raise it to centre height, so instead I mounted it in the four jaw chuck. I was concerned that it would be a bit precarious but I had no problems. When boring the hole nearest to the chuck the boring bar flexed rather alarmingly but by taking light cuts and several at the same setting it turned out well.
NormanV:
I also made the bushes to mount the worm, when pressed in the worm rotates freely and without any play.
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