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  1. #1
    Join Date
    May 2020
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    Willowbank QLD
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    Default 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

  2. #2
    Join Date
    Sep 2012
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    York, North Yorkshire UK
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    6,434

    Default

    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.

  3. #3
    Join Date
    May 2020
    Location
    Willowbank QLD
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    513

    Default

    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

  4. #4
    Join Date
    Nov 2017
    Location
    Geelong, Australia
    Age
    57
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    2,651

    Default

    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

  5. #5
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    May 2020
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    Willowbank QLD
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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

  6. #6
    Join Date
    Jul 2011
    Location
    Adelaide
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    837

    Default

    Quote Originally Posted by Reidy41 View Post
    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
    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.

  7. #7
    Join Date
    Jul 2011
    Location
    Adelaide
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    837

    Default

    Quote Originally Posted by Reidy41 View Post
    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
    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.

  8. #8
    Join Date
    May 2020
    Location
    Willowbank QLD
    Posts
    513

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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

  9. #9
    Join Date
    Jul 2011
    Location
    Adelaide
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    Quote Originally Posted by Reidy41 View Post
    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
    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

  10. #10
    Join Date
    May 2020
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    Willowbank QLD
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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 .

  11. #11
    Join Date
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    Perth WA
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    Quote Originally Posted by lamestllama View Post
    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.
    Like this.....

    Screenshot 2024-03-13 092908.png Screenshot 2024-03-13 093136.png IMG_20240313_091419601.jpg IMG_20240313_092035217.jpg

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