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How Do I Mount This Trimmer To This Bench Grinder?

Discussion in 'Handloading and Reloading' started by peeplwtchr, Mar 23, 2021.

  1. peeplwtchr

    peeplwtchr Member

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    Hi All-

    I was using this Giraud Tri Way trimmer with a hand drill, but would like to mount it on this bench grinder instead. I've never had a grinder before, so I'm not sure what type of fitting to buy. Suggestions are appreciated. :)

    The giraud rod is .371 inches, and the grinder rod is .631 inches.

    Thanks!
     

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  2. Demi-human

    Demi-human Member

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    3400 rpm is kind of fast.:eek:
    But a thread adapter would do it, assuming one with the correct thread pitch for both can be found.

    Oops, one needs a set screw, thought they were both threaded.

    Do you have a speed controller?
     
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  3. peels

    peels Member

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  4. BigBlue 94

    BigBlue 94 Member

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    Using a heavy grinding wheel or even a heavy piece of steel on the opposite end will slow the speed down a bit.
     
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  5. peeplwtchr

    peeplwtchr Member

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    Thanks, I got this one because its variable speed.
     
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  6. peeplwtchr

    peeplwtchr Member

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    Yeah, it's variable speed.
     
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  7. peeplwtchr

    peeplwtchr Member

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    Wow this thing is cool. I'm gonna grind all kinds of stuff.
     
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  8. AJC1

    AJC1 Member

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    Cutting brass usually happens at much slower speeds. I'm not going to say is a bad idea but I would contact the manufacturer for a maximum rpm. They will likely be quite surprised at your speed range. I would say your most likely exceeding the design specifications of that tool.
     
  9. Demi-human

    Demi-human Member

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    I couldn’t find much of anything I would want to spin up to even a thousand RPM. Something like what @peels has, but a 5/8x11 threaded on the arbor side. Maybe just a clamp on would work, but I’d rather have it threaded on.
     
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  10. peeplwtchr

    peeplwtchr Member

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    Thanks for the heads up, but that occurred to me as well, AFTER I bought a fixed speed $60 Ryobi, so I checked the Giraud manual. The recommended speed is between 1000 and 3500 rpm. This bottoms out at 2000 rpm. Great points guys!
     

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  11. peeplwtchr

    peeplwtchr Member

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    Seems decent for $110. Thing weighs about 50 lbs.
     

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  12. peeplwtchr

    peeplwtchr Member

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  13. peels

    peels Member

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    Yeah. Thats the typical name for it. You can tell I tried to search for 5/8 x 3/8 in the link...but didn't get any hits. You may be able to order a 5/8 to 1/2 and then use a shaft bushing to step up from 3/8 to 1/2. Not ideal, but I think for brass trimming, it should be ok.

    https://www.amazon.com/Amana-RB-122-Precision-Reducer-Overall/dp/B000P4ULRS/ref=mp_s_a_1_45?dchild=1&keywords=3%2F8+shaft+sleeve&qid=1616553759&s=industrial&sr=1-45
     
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  14. FROGO207

    FROGO207 Member

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    I took an old battery drill that ran on 12 volts and secured it to a base with 2 big hose clamps. Mounted my trimmer and adjusted the speed by a zip tie on the trigger. Powered from an old battery charger with a switch in line. That grinder looks nice though.
     
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  15. jmorris

    jmorris Member

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    That right side would be the side to use, the other end is likely left hand threads. I would bore a piece of steel so it is a good fit to the shoulder of the shaft and tap it deeper so it runs as true as possible, then counter bore for the attachment and drill and tap for a set screw.
     
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  16. drband

    drband Member

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    Wouldn’t it be easier to just mount the trimmer in a drill press ... ?

    Of course, you must have a drill press to do so. Just thinking you are taking 1/2 of the grinder’s usefulness away if you mount the trimmer on it in fixed fashion as you describe.
    I have my similar case trimmer mounted in my drill press and it’s a matter of 5 seconds to remove if I want to drill something.

    But, a grinder mounted trimmer as you describe would certainly work and be convenient.
     
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  17. jmorris

    jmorris Member

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    Absolutely but that wasn’t the question. :)

    A little bench top drill press would be a good choice, especially if he would have to pay someone to machine an adapter for him. That might cost more than the drill press.
     
  18. AJC1

    AJC1 Member

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    My drill press is my case prep center where all the attachments go. Trimming, pocket uniforming chamfer, debur and anything else I need.
     
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  19. gifbohane

    gifbohane Member

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    Can you provide a picture? I would have thought that looking down at the press would make it inefficient to use?
     
  20. Rule3

    Rule3 Member

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    I just clamp my electric drill in a bench vice and use the trimmer like that. Drill is variable speed with a lock trigger.
     
  21. rfwobbly

    rfwobbly Member

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    1. When heavy objects spin fast they become dangerous to the user. That is, they can fly off the motor and the user could be struck and seriously hurt.

    When I attached my son's Giraud Tri Way cutter to his 1725 RPM motor, I used a non-flexible Rigid Shaft Coupling. These clamp the cutter securely to the un-threaded motor shaft AND maintain concentricity, which is required to maintain system balance. The threaded shaft end will NOT maintain concentricty, which will lead to extreme vibration (from imbalance) and the danger of flying off.

    These Rigid Shaft Couplings are available from McMaster-Carr, Grainger, and many other industrial supply houses. I happened to find a new old stock (NOS) item on Ebay for a fraction of it's list price.

    Most Shaft Couplings are flexible and these will ABSOLUTELY not work. CLICK HERE and scan down the page to the clamp on Rigid Couplings section.

    2. To further limit my son's danger, I wired up a simple foot operated power switch. This sits on the floor under the trimmer. When the trimmer is needed, he places his foot on the switch and trims the cases. When his foot is removed, the motor returns to the OFF condition and the risk is again zero. These type foot switches are sold on Amazon. CLICK HERE

    Hope this helps.
     
    Last edited: Mar 24, 2021
  22. Just4FunOldGuns

    Just4FunOldGuns Member

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  23. rfwobbly

    rfwobbly Member

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    In order to fit a drill chuck, your shaft would require BOTH the 1/2-20UNF thread AND the correct alignment shaft diameter. In a drill chuck, the threads do the holding and the shaft does the alignment.

    Since the motor spins at 3400 RPM (2X the recommended), the concentricty specs of the chuck would be important to know.
     
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  24. peeplwtchr

    peeplwtchr Member

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    [QUOTE="rfwobbly, post: 118737

    The threaded shaft end will NOT maintain concentricty, which will lead to extreme vibration (from imbalance) and the danger of flying off.

    Hope this helps.[/QUOTE]

    Thanks.

    Wow that sucks, the motor shaft is threaded. Maybe I'll just keep using my drill.
    :(
     
  25. peeplwtchr

    peeplwtchr Member

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    The guy on youtube I got the idea from cut the threads off his, then used a Coupling. I'm fine with that, I just can't seem to find the 5/8 x 3/8 Coupler anywhere. I'll keep looking. I even called Grainger and a Mech Carr(?) place.
     
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