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Thread: Rotary table for O mill
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16th Jul 2021, 01:49 PM #16Senior Member
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Thank you Bob for all of the photos, Very helpful indeed, Sorry to hear you broke the casting, like the ball crank over the indexing plates, definitely a much better and easier way to use it, I like the way you have double indexed the dial, much easier than trying to add up 4.5 degrees each rev of the crank handle, In the gear that my uncle had there were also a couple of motor/ input gears for the mills, there were 2 different sizes so I assume again that they may be standard and high speed gear ratios or maybe the later three slot had a higher speed range and that is what they are for.
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19th Jul 2021, 05:15 PM #17.
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A Tee Square and the Dining Table.
IMG_20210719_142520293.jpg
No erase button and no Liquid Paper. The 7/16 " shaft is 3.4375" in length. The length may need to be adjusted to minimise axial play in the eccentric bush and if the bush is made prior to making the shaft the shaft diameter should be made to suit the bore. The thread on the left hand worm end of the shaft is also 5/16" BSW. I think the oil nipple on my eccentric is 1/4" UNF.
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19th Jul 2021, 06:24 PM #18Senior Member
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Thank you Bob, Very helpful as always.
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21st Jul 2021, 12:02 PM #19Diamond Member
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Drawing with Tee Square
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21st Jul 2021, 02:33 PM #20Most Valued Member
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Bob,
you might want to edit your 3/32" off set dimension, it looks like your decimal point is in the wrong place.
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21st Jul 2021, 03:00 PM #21.
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21st Jul 2021, 03:29 PM #22.
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30th Jul 2021, 02:34 PM #23australian metalworking hobbyist
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16th Aug 2021, 09:37 PM #24Golden Member
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I finally got around to taking apart the mechanism on my hercus dividing head and the mechanism Bob has drawn up is basically identical - apart from being longer. Good to know.
I also realized that the bolt that mates with/into the 0.202 width slot is used as a stop for the rotation ( I had thought it was used by the bolt to push the worm engagement into the worm wheel). The worm is 1.0625" long.
Cheers
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17th Aug 2021, 09:51 AM #25.
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17th Aug 2021, 03:00 PM #26Golden Member
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Thanks Bob, that’s exactly what I mean
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20th Feb 2022, 11:32 AM #27Senior Member
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I have finally gotten off my butt and started work on this project again, I was just wanting to get a a few bits and pieces done so they are close to being ready when I get the rest of the bits from Michael G to assemble them. I have made one shaft and concentric bush to play around with.
I found that after playing around with them the tables were not sitting flat on the base, there was a big radius on the table and even though there is a big chamfer on the body there still was not enough clearance for it to bottom out, I machined the radius back and made it a lot smaller and now everything is sitting nicely, it was having trouble with tight spots and when I measured the overall height they were between 2 to 3 mm higher than the base and top dimensions measured. I have also picked up a dividing head so there is at least something to compare the rest of the parts to, I am also in the process of making the handles for the worm drive.
Lucky for me there was one body for the 3 slot table in the mix of parts.
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20th Feb 2022, 08:22 PM #28Golden Member
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Hi Steve,
looking good
Thats exactly what I found on mine - that the large radius didn't let the table bottom out on the base. mine didn;t need much of a clean up either. Think they would have machined it just a little more on that diameter when they made them.
cheers
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16th Mar 2022, 07:34 PM #29Senior Member
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I had a bit of spare time on my hands the other day so I decided to turn up a shaft and eccentric bush for the rotary table with a handle and degree dial, I pretty much used Bob's design just made a one piece unit with a slightly different dial, saves using the dividing plates, I still need to mark up the dial but I might be able to get that engraved on the CNC at work with a bit of luck, I had a spare handle for a milling attachment that I had found in one of the machines I had purchased so that was a bonus although I had been looking at either a cross slide spindle handle or the bigger one from the attachment so I went with the latter.
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16th Mar 2022, 08:46 PM #30.
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Looks the part Steve, well done !!
The additional leverage afforded by the larger ball handle won't go astray. I was tempted to replace the cross slide handle I used with a handwheel but Hercus' smallest is 3 3/4" in diameter, a touch too big.
Bob.
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