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Thread: New Hercus tool grinder
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26th Jan 2024, 05:43 PM #1Golden Member
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New Hercus tool grinder
I picked up a Hercus tool grinder today. I am new to these and have a couple of questions, with more to come no doubt.
In the second photo there is a nut. Is loosening the nut all that is required to change the angle of the spindle in relation to the table. Nothing moves and I don't want to force things.
A manual would be handy but first I will need to work out exactly what model I have. I could not see a serial number or data plate.
It seems in reasonable nick but it appears that the spindle has been greased. Should oil have been used? If so I will strip and clean. It looks like someone has used grease on all points.
I could not get the first photo to be the correct way.
20240126_161316.jpg20240126_161326.jpg
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26th Jan 2024, 08:05 PM #2
Hi Steve,
From the second picture, it looks like the head had been pinned, or a bolt head has been broken off.
As far as pictures needing rotating check out this link.
https://metalworkforums.com/f316/t20...sting-pictures
PS. Yes I would think that oil would be used !Best Regards:
Baron J.
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26th Jan 2024, 08:40 PM #3Golden Member
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Thanks Barron
This should be the correct way now.
I suspect it is a pin to set at a common angle for the previous user, but it won't pull out. It may be a broken bolt that does not want to turn. So before I start drilling stuff I am keen to find out if it is a standard feature or a home modification. In short, step away from the tools until I have the facts.
grinder.jpg
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26th Jan 2024, 09:34 PM #4Most Valued Member
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That pin may just be to lock the spindle casting to the motor mount plate, but could be as you suggest to lock the head at a particular angle.
Does it look broken off or slightly peened on the top?
If you loosen the nut a turn then gently lever or percussion persuade the motor mount plate upwards you may get enough gap to slide a feeler gauge or similar in between to feel if the pin goes through into the main column casting.
Steve
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26th Jan 2024, 10:22 PM #5Golden Member
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Thanks Steve. I have now pulled the motor mount and spindle of the top of the column. It would appear the pin is there for a reason. There is a clamp at the back of the column that looks like it should be loosened and the sleeve would spin in the column. Either there is more than one clamp needs to be loosened or the sleeve is seized. I will definitely need instructions how it should be rotated as I don't want to force something that should not move. I will add an extra photo tomorrow. Steve
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28th Jan 2024, 10:49 AM #6Golden Member
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An the Hercus #3 (which this is) and the #3A it is the table that rotates not the grinding head. So undo the bolts on clamping the knee to the column and rotate the whole assembly to the angle relative to the grinding head.
I have had a #3A which uses the same method of changing the orientation of the wheel to the head but can't remember if that pin was present. However Kryn has that machine now so likely he could look.
I think its more likely as on my current #1 used for attaching a flute following finger that stays stationary while the table moves.
BTW the bearings on the #3A and #1 use oil and the #3 has the same spindle arrangement.
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28th Jan 2024, 10:50 AM #7Golden Member
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On the Hercus #3 (which this is) and the #3A it is the table that rotates not the grinding head. So undo the bolts on clamping the knee to the column and rotate the whole assembly to the angle relative to the grinding head.
I have had a #3A which uses the same method of changing the orientation of the wheel to the head but can't remember if that pin was present. However Kryn has that machine now so likely he could look.
I think its more likely as on my current #1 used for attaching a flute following finger that stays stationary while the table moves.
BTW the bearings on the #3A and #1 use oil and the #3 has the same spindle arrangement.
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28th Jan 2024, 01:27 PM #8Golden Member
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Thanks very much lamestllama and Steve. I have now established the pin is there and meant to be permanent to align the base, motor mount and work head. Undoing the two bolts at the back does indeed allow the table to swing freely. Such a simple design and surprisingly obvious now I understand how it is meant to work.
If anyone has a PDF of the manual I would love a copy.
Steve
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28th Jan 2024, 02:36 PM #9Golden Member
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I doubt there is a #3 manual in existence however I do have a #3A manual and these other bits
hercus 3A T&C Manual.pdfHercus 3A Brochure.pdfHercus No.1 Brochures.pdf
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28th Jan 2024, 03:53 PM #10Golden Member
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Thanks very much for these PDF's, I am a fan of reference material. I would say you are a very useful and helpful Llama .
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13th Mar 2024, 12:49 PM #11.
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