• Scam Alert. Members are reminded to NOT send money to buy anything. Don't buy things remote and have it shipped - go get it yourself, pay in person, and take your equipment with you. Scammers have burned people on this forum. Urgency, secrecy, excuses, selling for friend, newish members, FUD, are RED FLAGS. A video conference call is not adequate assurance. Face to face interactions are required. Please report suspicions to the forum admins. Stay Safe - anyone can get scammed.

Disassembling a Rohm Chuck?

T

Tecnico

(Dave)
Premium Member
Quick question: Does a 1/2" Rohm plain bearing chuck come apart like a similar Jacobs?

Said differently, does the outer collar (with the teeth the key engages) press off toward the nose of the chuck like a Jacobs?

I've gotten around to opening the chuck that came with my mill to clean it and I don't want to break it! Can't find anything on the web, only a zillion stories about taking apart Jacobs chucks. I can open the Jacobs with a vise (rather than a press) but the Rohm seems reluctant......

Thanks,

D :cool:
 
Last edited:
ChazzC said:
I didn’t view anything other than the intro, but does this help:

Click to expand...

I saw that. That’s the chuck.

I actually have two of these chucks, I planned to take apart the worst one first. It came with my First mill and it is way out of spec and stiff, a good candidate for a tear down. I actually bought another chuck for daily use on the mill.

The other came with my Standard Modern and is more or less usable after soaking in thinner and oil for a while and working it like the video but it is still a bit sticky at one end. If the first one goes well then that one is next.

I’m surprised that there’s next to nothing about Rhoms out there, maybe they’re so old that all the documentation is on paper. :oops:

D :cool:
 
UPDATE: Might as well put this here for anyone who has the same idea in the future...... Spoiler: @ChazzC gets the prize for the answer closest to correct.

I got in contact with Rohm (handed off to NA Service....) to ask how they came apart, their initial reply was they don't offer service on these chucks because you might as well buy a new one for the cost.

Asked the question again and they sent me a cut away assembly drawing (in German) which looked like the sleeve would slide (press) off upward vs down like a Jacobs. Just what I was looking for, almost. It included an annotation that said: "Huelse eingesickt".

Google translate wasn't much help but I landed on a German version of their E-COM page for a similar product which said: "- die Hülse ist auf den Zahnkranz aufgepresst und zusätzlich eingesickt" which Google translated for me to mean "Sleeve pressed onto the gear ring and beaded in, this connection is practically inseparable"


Disappointing, so much for opening the chucks for cleaning. :rolleyes:

I guess there's not much to lose by putting them in a jar of lacquer thinner or similar (suggestions?) for a few months to dissolve the gunk inside. I bet an ultrasonic bath would be useful.......

On to the next Project 42, level z.

D :cool:
 
Tecnico said:
UPDATE: Might as well put this here for anyone who has the same idea in the future...... Spoiler: @ChazzC gets the prize for the answer closest to correct.

I got in contact with Rohm (handed off to NA Service....) to ask how they came apart, their initial reply was they don't offer service on these chucks because you might as well buy a new one for the cost.

Asked the question again and they sent me a cut away assembly drawing (in German) which looked like the sleeve would slide (press) off upward vs down like a Jacobs. Just what I was looking for, almost. It included an annotation that said: "Huelse eingesickt".

Google translate wasn't much help but I landed on a German version of their E-COM page for a similar product which said: "- die Hülse ist auf den Zahnkranz aufgepresst und zusätzlich eingesickt" which Google translated for me to mean "Sleeve pressed onto the gear ring and beaded in, this connection is practically inseparable"


Disappointing, so much for opening the chucks for cleaning. :rolleyes:

I guess there's not much to lose by putting them in a jar of lacquer thinner or similar (suggestions?) for a few months to dissolve the gunk inside. I bet an ultrasonic bath would be useful.......

On to the next Project 42, level z.

D :cool:
Click to expand...
Thanks, but “close only counts in horse shoes and hand grenades.”

About 5 years ago I had a stiff (not rusty, just hadn’t been used in years) small keyless chuck that I soaked in Mineral Spirits for a couple of days, allowed to drain overnight then wrapped in a couple of paper towels secured with a rubber band and spun at low rpm’s to dry: works like new to this day.
 
ChazzC said:
Thanks, but “close only counts in horse shoes and hand grenades.”
Click to expand...

LOL!
ChazzC said:
About 5 years ago I had a stiff (not rusty, just hadn’t been used in years) small keyless chuck that I soaked in Mineral Spirits for a couple of days, allowed to drain overnight then wrapped in a couple of paper towels secured with a rubber band and spun at low rpm’s to dry: works like new to this day.
Click to expand...

The worst would become a #2 for the mill. It came with it and I suspect it's 1987 vintage like the mill. It has all those years of accumulated patina & dried cutting oil in it (as did the whole mill) so I expect it would need a long soak in something rather nasty to soften up all those years of accumulation. To say more, when I first tried it out it was quite stiff and had a really bad TIR so I just bought a new chuck for the mill.

The other is on my Standard Modern and is usable after soaking down with light oil and exercising but it really needs a cleanup too.

D :cool:
 
140mower said:
Sounds like a great time to treat yourself to an ultrasonic cleaner........ Tell the wife I said so...... It won't mean much of anything, but you never know, you might catch her off guard. :rolleyes:
Click to expand...

LOL! You underestimate Ms. Tecnico at your peril! We're planning a cross country trip when she hangs it up and you might have to explain the logic to her in person if we drop in on the way by. ;)

You know I've thought a few times about an US cleaner, including when I was dip tanking all 4 carbs from her bike a while back. That stuff is absolutely evil. Hmm.... might be good for dipping a cruddy chuck too......

D :cool:
 
Tecnico said:
You know I've thought a few times about an US cleaner, including when I was dip tanking all 4 carbs from her bike a while back. That stuff is absolutely evil. Hmm.... might be good for dipping a cruddy chuck too......

D :cool:
Click to expand...
The good thing about Mineral Spirits is that they leave a film of petroleum-stuff that may not lubricate but at least protects.
 
Tecnico said:
LOL! You underestimate Ms. Tecnico at your peril! We're planning a cross country trip when she hangs it up and you might have to explain the logic to her in person if we drop in on the way by. ;)

You know I've thought a few times about an US cleaner, including when I was dip tanking all 4 carbs from her bike a while back. That stuff is absolutely evil. Hmm.... might be good for dipping a cruddy chuck too......

D :cool:
Click to expand...
Get an US cleaner. You’ll wonder why you waited so long. Vevor 6 litre seems to be the sweet spot of size vs. price. Has an integral heater that goes to 50C. Was cheaper than buying a new carb for my bike, and does a great job. And has a drain valve, smaller ones don’t.

www.vevor.ca

VEVOR Professional Ultrasonic Cleaner, 6 L Ultrasonic Jewelry Cleaner with Digital Timer & Heater, Stainless Steel Industrial Sonic Cleaner 40kHz for Glasses, Watches, Rings, Small Parts | VEVOR CA

Shop VEVOR Commercial Ultrasonic Cleaner for professional-grade cleaning. With 40kHz frequency, advanced transducer technology, and a digital control panel, it dissolves grime and restores shine.
www.vevor.ca www.vevor.ca

IMG_7533.jpeg


IMG_7534.jpeg
 
You must log in or register to reply here.
Back
Top