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What Size Hook/Pin Wrench Do I Need?

YYCHM

YYCHM

(Craig)
Premium Member
ER32Chuck.JPG


I need a hook/pin wrench to grab onto this 5" ER32 Chuck. The chuck mount is 125 mm dia. and the pin/hook needs to be 7 mm dia.

I'm thinking something like this


But not sure what size I would need.

Thanks,

Craig
 
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The ones I've seen generically look like this. But as to quality, not sure there. Also I've heard some of the offshore collet chuck bodies kind of do their own thing on OD & slots which would be a bummer. So maybe confirm OD & slot width layout if you can

Forged ER Collet Nut Wrenches - Arc Euro Trade

Forged steel ER Collet nut wrenches with a comfortable soft grip, non slip handle - ER25, ER32 & ER40.
www.arceurotrade.co.uk www.arceurotrade.co.uk
 
You've the room, I wonder if you could integrate MiteeBite cam fixture clamps to make it a pseudo Set-Tru ER collet

1668794938688.webp


www.miteebite.com

Fixture Clamps

Fixture Clamps The Cam Action MITEE-BITE Fixture Clamp is made up of two simple components: a hardened steel socket cap screw with an offset head and a brass hexagonal washer. - Low profile for quick and easy installation for linear motion guide rails - Cam action...
www.miteebite.com www.miteebite.com
 
I don't need a wrench for the collet chuck nut, I have that. I need a wrench to grab onto the 5" chuck back plate. You can see the hole in the outer edge for a pin in the image.
 
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Is it because when you tighten the collet that you don' want the ER plate to slide relative to the backplate or something? The ER plate is presumably bolted/pinned firm to the back plate? Can you not put the lathe in low gear & just tighten ER nut that way for some reason?

Anyway, how about just a plain steel rod with a handle on it? It would offer more leverage. A C-span wrench might align the arc to the OD nicer but 5" is a big one. Presuming you find one, the wrench thickness might exceed your flange width. Anyways, sorry, never seen one like that but I haven't had a requirement
 
I made one for my chuck (5/16 flat bar) and haven't needed it yet. I put the HS in the lowest gear and that gives enough braking power to tighten the collet nut sufficiently. Granted that's on stock under .5" so anything larger may need the wrench but I'll cross that bridge when I get there.
 
YotaBota said:
I made one for my chuck (5/16 flat bar) and haven't needed it yet. I put the HS in the lowest gear and that gives enough braking power to tighten the collet nut sufficiently. Granted that's on stock under .5" so anything larger may need the wrench but I'll cross that bridge when I get there.
Click to expand...
I made a wrench as well and determined it was almost useless! Like you said, lowest gear and a good yank to loosen the nut.
 
phaxtris said:
If you make a napkin sketch with dimensions, I'll see what I have for plate and cut one for you craig
Click to expand...

Something like this I guess......

Wrench.JPG


How would you cut one? I have 3/8 and 1/4 plate but have been perplexed as to how to cut one out per say.
 
YYCHM said:
@PeterT , @YotaBota , @thestelster The problem I'm having is removing the whole assembly (chuck and back plate) from a threaded spindle. There are no flats to employ a wrench.
Click to expand...
That makes a difference, I thought you were having trouble tightening/loosening the collet nut.

I rough cut my wrench with the angle grinder and used the RT for the arcs then filed the tooth to shape. Make sure the handle is long enough to tap with a hammer if needed and again putting the HS in low gear and taking the slack out of the gears before tapping.
 
YYCHM said:
Something like this I guess......

View attachment 28073

How would you cut one? I have 3/8 and 1/4 plate but have been perplexed as to how to cut one out per say.
Click to expand...

I have a CNC plasma, but really it could be cut by hand, torch, plasma....or worst case it could be cut out with a grinder, and profiled with a grinder.....that's obviously the least fun way of doing it though

The pin on the last hook wrench I made was just welded onto the hook, a piece of bolt iirc, that's the only change I would do with your drawing
 
phaxtris said:
I have a CNC plasma, but really it could be cut by hand, torch, plasma....or worst case it could be cut out with a grinder, and profiled with a grinder.....that's obviously the least fun way of doing it though

The pin on the last hook wrench I made was just welded onto the hook, a piece of bolt iirc, that's the only change I would do with your drawing
Click to expand...

If you want to plasma cut one for me that would be great. I have 3' of 6" wide 3/8" or 1/4" plate if needed.

Craig
 
YYCHM said:
If you want to plasma cut one for me that would be great. I have 3' of 6" wide 3/8" or 1/4" plate if needed.

Craig
Click to expand...

I'll turn that into a DXF this evening and cut one for you tomorrow

I have lots of plate i get for free, keep yours for another project

What is the diameter of the pin ? I can make it short that much and weld on a pin, or you can weld on a pin, otherwise you'll be filing
 
phaxtris said:
What is the diameter of the pin ? I can make it short that much and weld on a pin, or you can weld on a pin, otherwise you'll be filing
Click to expand...

Ideally the pin would be 0.275" dia and protrude 0.325". I don't have welding capability.

Thanks,

Craig
 
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