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Grinder plans

Discussion in 'Shop Talk - BladeSmith Questions and Answers' started by Kevin McGovern, Mar 20, 2017.

  1. Kevin McGovern

    Kevin McGovern KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jul 31, 2015
    Here are some captures out of solid works. This is a modified eerf grinder. When I post the cad files, they include everything here except the tool arms. It will also have the tool rest. Let me know what you think.


    [​IMG][​IMG]

    Here is a link to the DXF file:
    https://drive.google.com/open?id=0BxDNgg5D6gjHVzl2U3JGaTBLTVE
    and the CAD file: https://drive.google.com/open?id=0BxDNgg5D6gjHYUVoUTRXNGFnLVk

    Let me know if they don't work.

    And here is what it looks like laid out on two 12"x 24" plates. Plates should be 1/2" if you intend to use this. just send the files to the waterjet guy, and you will get back what you see below. The holes to be tapped are undersized for that purpose. These have my mark on the main upright, the files I posted do NOT.

    [​IMG][​IMG]

    If anyone needs solidworks files, I have those as well.

    3-22-2017 1609- DXF and DWG files updated.
     
    Last edited: Mar 22, 2017
  2. jrrector

    jrrector

    30
    Sep 21, 2015
    Someone is an engineer aren't they....LOL....with shadows and reflections...
     
  3. Kevin McGovern

    Kevin McGovern KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jul 31, 2015
    My CAD guy is a wizard.
     
  4. MBurks

    MBurks

    266
    Mar 21, 2016
    It looks like the belt tension will be a spring in the back pulling?

    I think I would change it so you could use a gas shock, extend the top back some over the tool arm.

    I don't know never used one like that but seems like a compressed spring or gas shock would be better.
     
  5. Boogaloo

    Boogaloo

    114
    Jun 20, 2013
    How is the main upright mounted to the base?


    Sent from my iPhone using Tapatalk
     
  6. MBurks

    MBurks

    266
    Mar 21, 2016
    Looks great though, any plans for a tilt feature?
     
  7. Kevin McGovern

    Kevin McGovern KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jul 31, 2015
    I left that up to the user, I will be using a gas shock, You just need to buy two mounts and bolt them to the bottom of the tension arm and one on top of the the left side tool arm retention plate. by not making mounts for the shock built in, you have more flexibility on what length of shock and it's position you can choose from.
     
  8. Kevin McGovern

    Kevin McGovern KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jul 31, 2015
    there is a tab on the upright and a corresponding hole on the base. There are holes in the base, that line up with holes YOU need to drill and tap in the bottom edge of the upright. I will be using flat head bolts that will be countersunk in the bottom plate. This is unchanged from the EERF design.
     
  9. Kevin McGovern

    Kevin McGovern KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jul 31, 2015
    I will most likely accomplish this on my build by mounting it on a thick plywood base with a hinge. No plans to incorporate it into the design, I wanted to keep it on two 12"x 24" plates for water jet/ plasma cutting.
     
  10. jrrector

    jrrector

    30
    Sep 21, 2015
    Kevin looks like you have some serious skill with drafting software...it takes me like 30 minutes to get a knife shaped object in CAD
     
  11. Kevin McGovern

    Kevin McGovern KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jul 31, 2015
    Not me. I have been working with my CAD guy. I owe him a knife now.
     
  12. mike-E

    mike-E

    227
    Mar 2, 2013
    the piece for the tracking that bolts solid to the arm looks like it needs to be a half inch longer. the wheel mounting half of the hinge should line up with the main plate when hanging vertical. you can always add more spacer behind the wheel, but its easier to measure for offset that way. have you seen the way i built mine with the over center cam and gas shock on top? this would be a good design to build like that. it would only require 3 small extra pieces and i guarantee you will not regret it. you could use a 3/8 or 1/2'' bolt for the pivot pin.
     
  13. Kevin McGovern

    Kevin McGovern KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jul 31, 2015
    I believe that's exactly how it lines up it may just be the rendering I posted looks different. Can you post a link to your tracking design? I lengthen the vertical arm on this design so the tracking arm can be almost parallel to the ground. I understand from other threads that this will Aid in tracking
     
  14. Kevin McGovern

    Kevin McGovern KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jul 31, 2015
    Actually I think I lined it up so it is in line with the D plate
     
  15. kuraki

    kuraki KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jun 17, 2016
    That's where it should be IMO. If they line up with the main plate, fine, if they don't, fine, as long as they're parallel to it they'll be parallel to the drive wheel. Whether they're in the same plane only effects how many or few spacers you need to keep your belt off of the plates and how much engagement the drive wheel has with the motor shaft.

    Keeping the tension arm parallel in nominal conditions keeps the hinge in relation to the axis of the belt where it will provide the most and most consistent tracking adjustment per angle of increment. As it swings out of parallel, the movement becomes more and more unrelated to the belt, and belt tension against the hinge is decreased.
     
  16. Ghostman3

    Ghostman3

    165
    Jan 12, 2016
    Can you put the tension arm in double shear as opposed to single? Might stay tighter like that.
     
  17. Kevin McGovern

    Kevin McGovern KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jul 31, 2015
    What do you mean? Two pieces? It's half inch thick so I don't think flex will be a problem. At least I've never heard of it being one on similar GIBs or EERF builds.
     
  18. Kevin McGovern

    Kevin McGovern KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jul 31, 2015
    I just checked ARCustomKnives youtube video on this. I think I'll forgo it for now. I already got a lot of work out of my CAD guy.
     
  19. Kevin McGovern

    Kevin McGovern KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jul 31, 2015
    Added file links for the DXF and DWG files.
     
  20. Kevin McGovern

    Kevin McGovern KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jul 31, 2015
    Some of the pieces for the tool rest I am not sure of their function. They are native to the eerf plans. I just left them.
     

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