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  #1  
Old 03-20-2017, 1:25 PM
kriller134 kriller134 is offline
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Default attaching giraud triway to bench grinder?

So I want to attach the triway trimmer to a bench grinder/buffer. I'm thinking all I need is a coupler. Is there anything I need to be worried about? I'm thinking about using this one from HF.
http://www.harborfreight.com/6-in-buffer-61557.html

What do you guys think?
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  #2  
Old 03-20-2017, 1:41 PM
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I don't have an answer to your question except that a bench grinder seems to be an awful lot of motor for trimming. You would have to build a blast shield around it in case the trimmer grenades.
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Old 03-20-2017, 2:28 PM
baih777 baih777 is offline
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NO.
That will spin too fast.
Dewalt 3/8 variable speed drill. Clamp it a vise and use zip ties for the trigger to set your speed.
Don't use Harbor freight drill, chuck does not spin smooth andncuasss vibration.

You only need a little more speed.than the powered trimmers. Saves a lot of time.
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Old 03-20-2017, 3:01 PM
kriller134 kriller134 is offline
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Quote:
Originally Posted by baih777 View Post
NO.

That will spin too fast.

Dewalt 3/8 variable speed drill. Clamp it a vise and use zip ties for the trigger to set your speed.

Don't use Harbor freight drill, chuck does not spin smooth andncuasss vibration.



You only need a little more speed.than the powered trimmers. Saves a lot of time.


Really? Giruad said to keep speed under 3500 rpm, but I think you're right about it not spinning smooth. I might have to rethink this. I'm trying to do this on the cheap but might scrap the whole idea.
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Old 03-20-2017, 3:09 PM
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You want to use a corded hand drill for four reasons.

1. You want it upright, not sideways.
2. 3500 is fine for the cutter, but you don't want a motor spinning 3500 unless it's well balanced. That HF isn't.
3. A drill has a chuck, you'll need to make or find a shaft coupling to mate the triway to that grinder.
4. A drill is variable speed, you want to be able to find a speed that works for what you are doing, not be locked into 3500rpm.
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Old 03-20-2017, 4:27 PM
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Speed is probably fine. Normally a grinder should be relatively smooth spinning I think. They have to be if they're going to spin big stone wheels without shaking themselves to death. But sideways could be an issue.

I use my Jet drill press at as high as the belts let it go. I think that's not too far off what you have.

Only advice: When the motor tries to snatch the brass out of your hand . . . just let it! Stop the motor and then start again.


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Old 03-20-2017, 5:39 PM
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Quote:
Originally Posted by croue View Post
Speed is probably fine. Normally a grinder should be relatively smooth spinning I think. They have to be if they're going to spin big stone wheels without shaking themselves to death.
Usually yes. Harbor Freight? No. Also a large wheel is a damper in this case.

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Originally Posted by croue View Post
I use my Jet drill press at as high as the belts let it go. I think that's not too far off what you have.
The motor isn't spinning faster, the belt is a gear multiplier. That's precisely the way you should do it, so you aren't spinning a crappy coil winding at 3500rpm. This is, in fact, how Giraud does it on his expensive trimmer.
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Old 03-20-2017, 5:43 PM
kriller134 kriller134 is offline
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So can you guys recommend a motor that will fit the bill without breaking the bank? I don't want to spend too much because I'd just get the expensive giraud at that point.
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Old 03-20-2017, 6:25 PM
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Buy a drill press for the trimmer. Works great
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Old 03-20-2017, 7:06 PM
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Quote:
Originally Posted by kriller134 View Post
So can you guys recommend a motor that will fit the bill without breaking the bank? I don't want to spend too much because I'd just get the expensive giraud at that point.
I did. Buy a corded drill with variable speed. You can buy DeWalt's for the same price as the grinder you linked.
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Old 03-20-2017, 7:38 PM
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Quote:
Originally Posted by kriller134 View Post
So can you guys recommend a motor that will fit the bill without breaking the bank? I don't want to spend too much because I'd just get the expensive giraud at that point.
Get a Gracey ,then buy a carbide bit from Bob Jones.
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Old 03-21-2017, 6:26 AM
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http://www.dumpstercnc.com/
Made me an adapter to use the 1/2" rod that spends my stainless steel brass cleaner. the motor that spends the tumbler is a good speed and if I'm remembering correctly you are supposed to run the trimer in reverse, I could be wrong about that it's been a while.
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