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Thread: Hercus model "O"
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11th Aug 2020, 11:07 AM #16Member
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Anorak/Bob my apologies I would have acknowledged your copyright on drawing had I known. Sourced same from Mal. Thanks for your expertise. And thanks Ulfr for asking the questions all of which are helping my own project.
tham60
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11th Aug 2020, 11:09 AM #17.
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Ulf,
You could purchase a blank end arbor and turn the blank to suit the gear's bore. This example has a M12 drawbar thread which can be ignored because a drawbar isn't required since the gear is screwfixed to the spindle nose. The arbor is required for alignment.
https://www.ebay.com.au/itm/RDGTOOLS...0AAOSw44BYPYak
Bob.
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11th Aug 2020, 11:22 AM #18.
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11th Aug 2020, 02:09 PM #19Novice
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Will do Bob! And may take you up on that Eric. At the moment I'm waiting on some possible/promising parts so see what happens there
In this photo, is this a drawbar and taper part (sorry I don't know what it is called) for tightening collets in the vertical head? I could be way off, just having a beginning hobbyist guess at what it might be.
I was separating out some parts from other machines and didn't know.
vertical head draw bar.jpg
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11th Aug 2020, 05:05 PM #20.
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Ulf,
Eric 'Lamestllama' asked me a question about 3C drawbars only the other day and I photographed my collection.
Hercus made a number of drawbars ( or draw in tubes ) of varying lengths to suit the No.O's vertical and horizontal spindles, the mill's dividing head, the lathe's indexing attachment for the vertical milling slide as well as a similar looking drawbar for the tool and cutter grinder's workhead. The handwheels differed on some of the drawbars, most were coarsely knurled but I have one long version that features the same fluting as yours but doesn't fit my early O's horizontal spindle. The unhandled tube in the photo is the correct length for my mill.
The last two photos show a three slotter with the 'draw in tube' installed in the vertical head. Same fluted style as yours.
The 'taper part' is simply called a nose adaptor.
IMG_20200804_163244647.jpg IMG_20200804_164412207.jpgUniversal-Milling-Machine_32005657.h.jpgUniversal-Milling-Machine_32005662.h.jpg
Bob.
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11th Aug 2020, 06:23 PM #21Novice
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Thanks so much Bob.
i have a longer one here too, I didn’t even consider could be for the mill (assumed lathe).
it has a wheel handle.
5E7639BB-E7B3-44A6-BC61-7F2CDCC4E9A8.jpeg
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11th Aug 2020, 08:45 PM #22.
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Ulf,
Good chance the wheel handled version fits a lathe. It looks the same as the one I use in my 9" spindle and it isn't long enough to be used in the O's spindle.
Bob.
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12th Aug 2020, 10:39 AM #23Member
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Noobhercusowner has posted (see below) a copy of the Hercus instructions on fitting the vertical head over the spindle nose, which specifies the use of a collar to align the mounting racket of the head. The mounting dowel holes are then drilled to size.
On a post some time ago by me, it was suggested that the dowels when turned to fit were stepped.
Question is in the absence of the aid of a mounting collar what is the alternative process to ensure correct alignment, if any?
Terry (tham60)
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12th Aug 2020, 08:40 PM #24Novice
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Good question Terry. I see 3 holes either side of my spindle so I suspect that is the four bolts (I think later are four) and two dowels but don’t know for sure.
Took the vice off For the first time in what could have been a long time so here is the before clean up/refurb pic.
I also have this thing which I know is used with the dividing head but not sure how or of its exact purpose. I tried searching but couldn't find answers.
Edit: I have just seen a pic of something similar holding a dog and I do have a little one in the pile that looks like it fits. Makes sense that you would need to tighten it on the dog on a mills dividing head.
909677AB-B7DA-4709-B603-393601902BB6.jpeg
1D7D5B0E-5B53-4377-AD1D-C2B438B34166.jpeg
76783E4D-3D4B-4409-AE91-0D89E9CA47DE.jpegLast edited by Ulfr; 12th Aug 2020 at 09:03 PM. Reason: Figured it out I think.
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17th Aug 2020, 10:35 AM #25.
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17th Aug 2020, 02:45 PM #26Senior Member
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17th Aug 2020, 08:39 PM #27.
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24th Aug 2020, 11:03 AM #28Member
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Mounting Collar
Seems the instructions and dimensions for the mounting collar for head previously posted are for the two slotter. What variations might there be to the procedure for the thee slot head? And does anyone have the mounting collar dimensions for the three slot version. I know I should be able to measure these out , however given my rank amateur status will greatly increases the margins for error.
Also it may be that the head I have has been fitted previously to another mill, the dowel holes in it already being at 5/16 as specified in the previous post. Is this likely to effect anything come mounting time?
Terry
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23rd Oct 2020, 06:10 PM #29Novice
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Many many thanks to Mal, I have a vertical head and tail stock for the dividing head
Will do the arbor/spiggot and dowels.
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23rd Oct 2020, 11:03 PM #30Novice
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Actually does anybody have a photo of the later model dowels? I did find two of these which fit the dowel holes and and have the smaller threaded end which seems to match the recessed thread in the dowel hole (didn’t push it, need to clean out mud wasp gunk).
They also work when you look at the corresponding holes on the head, did they perhaps use these dowel pin/bolts for locating the head in later models? I haven’t read anything like that but it makes sense.
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