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Thread: Wanted Hercus 3A T&C manual
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28th Feb 2020, 10:10 PM #16Golden Member
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There is a brochure for the Hercus #1 T&C grinder that details a lot of setups here it is.
Hercus No.1 Brochure.pdf
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29th Feb 2020, 01:56 PM #17Senior Member
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- Nov 2019
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tool and cutter grinding.
Hello Phil.
Tool and cutter info is hard to find, especially for a particular machine. A very good site to visit is Bedroom Workshop. It is run by a Clarkson fan and he has been collecting pics and stories on mods for years. Thru the grime you can pick up a lot of hints there. Youtube has a lot of videos of worth but you have to sort thru the fools to find it.
I suggest mastering one operation at a time and try to think ahead with tool holding. For my Clarkson I bought a ER32 collet chuck with a 25mm plain shank. it doubles with my milling collets but soon I'll buy some more. Very easy to adapt for indexing.
Give me a message if I can help.
Regards
Ol Goat.
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2nd Mar 2020, 10:44 PM #18Senior Member
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- Mar 2013
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- Mt Pleasant SA
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Hi Peter, if the vee-ways on your #3 are in good nick there's an easy transformation you can do. Mine were as new, it had been owned by the Airforce & I judge unused as every oil nipple had been pumped up with grease. Anyway the mod. is this: you buy two INA linear needle roller sets from CBC, for the table slideways, just the needle/cage assemblies, no raceways required, the total load bearing area is such the Hercus iron is not over-stressed. The needle rollers are in a double row in a nylon-looking cage which is supplied thinned down the middle for bending to conform to a vee. I THINK one caged set per side is enough for 1) adequate support 2) adequate table travel. I say this coz I do remember a dovetail slot each end for assembling into longer assemblies. I can check that in a few days (uncommonly busy), can't remember, having done this about 30 years ago. The only other things required are to shim the rack by the thickness (diameter) of the rollers .. I think 1.5 or 2mm. AND you'll need to slot the screw holes in the table keeps. That's it. Well not quite .. because table movement to the extent possible exposes the vee-ways it's necessary/desirable to make some table extensions (like shallow inverted trays) to protect them from grit. I also added a skirt front & back to keep grit out of the needle rollers. The conversion makes the grinder a delight to use, especially for cylindrical grinding & surface grinding. Mine has performed beyond its warranted ambit for 30 years & no sign of Brinelling the cast iron vee-ways despite a 1200 km truck tray journey simply locked for longitudinal travel. Sorry I can't provide part numbers etc, I haven't kept those records. You'll need to talk to CBC or failing that INA themselves. If you need them I can take some measurements in a few days time.
Trev
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3rd Mar 2020, 06:27 AM #19Senior Member
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8th Mar 2020, 07:14 AM #20Senior Member
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Hi Trev,
Thanks for letting me know about this modification. I've been thinking about this and wondering if you have pictures and dimensions of the INA needle roller bearings you used. How long where your bearing sets? I've included a link below to something I found online. They don't appear to be expensive either. how did you fix these on? I'm assuming screwed down onto the male V way on the cross slide. How many did you use? Did you get full coverage of the vee way or just evenly spaced.
I think the X axis ways are in good shape on this machine but I can't say the same for the Y axis leadscrew. This machine has had a lot of work but is still very usable.
https://www.motionindustries.com/pro...p?sku=00093007
Regards,
Peter.
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9th Mar 2020, 10:07 PM #21Golden Member
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11th Mar 2020, 10:53 PM #22Senior Member
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Hi Peter, sorry about the delay, I don't visit often. However the example you linked to appears to be similar to the ones I used. You'll need to verify that they can be 'clicked' together to form a longer assembly, but I also need to check the dimensions. I did take some measurements but seem to have mislaid the piece of paper recording them. However I can confirm the 2.5 mm roller diameter. I think the rollers were 12mm long. The needle roller assemblies are NOT attached to anything, they simply 'float' between the table & the knee. Over a long period (years) the caged assemblies may creep one way or the other but that is easily detected & corrected. I'll retake the measurements & try taking some snaps but give me a week or so, very busy at present. Just had another look at your link, my cage + roller assemblies were wider (obvious from the needle length). Unfortunately the recent fires near here prompted us to shed all our superfluous historical paperwork .. my old order books included, so I have no record of the purchase details. I'll be able to give you the assembled length of the cages but the joints are difficult to detect so I won't be able to tell you the individual section lengths. The length is such that with the table in mid stroke there is free space equal to quarter of the total table stroke each end, i.e. the cage is half the length of the table stroke (I think, will confirm).
Llama: two inverted vees.
Trev
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12th Mar 2020, 07:10 PM #23Senior Member
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[QUOTE=swarfless;1964448]Hi Peter, sorry about the delay, I don't visit often. However the example you linked to appears to be similar to the ones I used. You'll need to verify that they can be 'clicked' together to form a longer assembly, but I also need to check the dimensions. I did take some measurements but seem to have mislaid the piece of paper recording them.
Hi Peter, private message sent.
Trev
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12th Mar 2020, 07:19 PM #24Senior Member
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I can confirm my machine has twod inverte vees
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12th Mar 2020, 11:06 PM #25Golden Member
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28th Sep 2021, 07:14 PM #26New Member
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Hercus 3a maunual
Hope I've managed to upload Hercus 3A manual here. BazHERCUS 3A TOOL AND CUTTER GRINDER.pdf.
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28th Sep 2021, 07:30 PM #27New Member
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- Apr 2021
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- wangaratta
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HERCUS 3A brochure
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