When you are reversing the jaws, you will need to switch the 3 and the 1, the #3 jaw will go into the #1 slot and so forth. The #2 stays in the same place. This will allow your chuck to close evenly. When you switch back, make go to also switch the jaws. This should solve your issue.

Thanks all for the replies, now sorted.
I was previously keeping the same sequence when reversing the jaws.1-1. 2-2, 3-3.

Glad it all works.

I keep telling folks that these motors are the thing to use, and they're easy to fit, but so many won't listen.

Post pictures of your installation please - the more we have the more others will be encouraged to have a go.

I just finished my 24volt scooter motor conversions for use on both of my Unimats.
The motors run so smooth and quiet. I wish I would have done this long ago. I now have variable speed and reversing ability.
I plan on selling both of my OEM Unimat motors and don’t intend to go back.
I have the power supply and motor control housed in a hinged metal electrical box which can hang on the shop wall or reside on a bench.
Thanks to all who helped me along the way with advice, etc. Your help is much appreciated and I learned a lot along the way. I am now richer for the experience. I don’t think I could have undertaken this project without this good group!!!
Dick

This past week, and yesterday, I got to spend more time in the school shop, working on my milling tables. got the countersinking done on the T-slotted table last Thursday. I'd originally laid out the other table to be T-slotted, as well, but decided that a drilled and tapped table would be handy, also, so I used the unmarked blank first, on the T-slotted table. Yesterday was the last day of school, and they had? a barbeque, so I spent some of the last class feeding my face, but I got the D&T table spot-drilled before the food was served, and then drilled out the tapping holes at 5mm, for M6x1 tapping, and drilled & countersunk the mounting holes. Holes are drilled 6.5mm, so they'll be a little sloppy, but that should make it possible to tap them true while tramming the milling setup. The Unimats aren't designed for extreme accuracy, but they are capable of giving good accuracy for someone who takes the time to do what is necessary. For too many years, I was the reason my mini-lathe wasn't turning out good work. That is over now! As long as I don't get in a hurry, anyhow! ;)?

I still need to do a bit of deburring, and I need to locate a couple of the T-nuts I have and see if they fit the slots I cut... Found where I'd hidden the vise, which had the T-nuts attached. They're a bit wide for the slots I cut, so I'm going to have to widen the slots a bit. My toolbox came in from the car when I got home last night, but I don't have good places to empty it into right now, so I think I need to spend as much as I can of the next few days getting the workshop in order. I have an HF Mini-mill her that I could fix a bit and do the work on, but it might works better to make a 10mm shank end mill holder and use the Uni to fix the "problem." After I measure and see how much wider I need the bottom of those T-slots. It looks like it's less than .5mm, and I could probably fix it with a needle file, if necessary. I also bought a package of t-nuts for 3030 aluminum extrusions.??I'm going to see about cutting some of them down. They are too thick, and a bit too long, and even modified won't be perfect, but might work well enough.? Also have a bar of 12mm keystock, and will make some more out of that one of these days.?

Gotta say, having a DRO makes this stuff really easy. Unfortunately, none of my home machines have DRO's. Yet.?

Bill in OKC

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A quick look at Ebay USA reveals several available, including item?384747687923, which is 5 for $30!

Thanks for all your comments, the correct chuck key is in the mail.

-- 
Don Bowen       --AD0NB--

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Hi Gang:

I would take your chuck to a pawn shop and ask to see their keys. Or buy this one:

One side has to fit, I hope?

You are welcomed to check out my spares too.

Carl.

A quick look at Ebay USA reveals several available, including item?384747687923, which is 5 for $30!

On Tue, May 10, 2022 at 03:44 AM, Edward Wainwright wrote:

I purchased a "ROHM" drill chuck key "S1"
ID - Nr. 26411

Ok, a quick search found one for sale here for ?4.25. I would happily post it to you if al else fails.

Here's a link for one on Amazon USA at $7.16:?https://www.amazon.com/Rohm-Chuck-Key-S1-Chucks/dp/B002UVPGFQ?th=1

Yes, as far as I can tell original Unimat drill chucks are made by R?hm. I think they came after Jacobs, and their system of numbering is more rational then Jacobs. If you find their website it shouldn't be too hard to find the correct key. How you buy one after that is another question. I there are no possible suppliers near you we will have to find someone. My local tool shop (UK) lists two R?hm chuck keys, but does not indicate which chucks they fit. Come to think of it I may have a spare one in the cupboard - I'll have a look and see if I can find another one like it.

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Hi Gang:

I used Freeze spray to remove chewing gum from carpets. Spray the gum and smack it with a hammer. Then vacuum up the dust. I guess the Freon was hard on the Ozone??

Carl.

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Hi Gang:

I used Freeze spray to remove chewing gum from carpets. Spray the gum and smack it with a hammer. Then vacuum up the dust. I guess the Freon was hard on the Ozone??

Carl.

I presume it is the same as the spray used in electronics to test components suspected to be failing due to thermal breakdown.
Freeze spray is used in other industrial applications also, I just don't know exactly where..
.
Google "electronic freeze spray" you will get many hits.
Also, as stated, canned air turned upside down will freeze things (but not as effectively as that is not what it is designed to do).

WHat size chuck key do I need for a unimat Jacobs chuck?? This is for
the older unimat, M12X1, 0-6.5mm capacity, 5mm pilot hole.

--
Don Bowen --AD0NB--

I understand now what is wanted. This part should be able to be produced on the Unimat if a threading attachment is available and a suitable thread master. There are other ways to accomplish this also, however, the desire to pursue this must be present before one begins as this would not be a quick project, but it would be a rewarding one.
Dick

Can you please identify "Quick Freeze".? A google search for "quick freeze can" may not be providing the right product.? I need to be able to buy online or at the local auto store or hardware.? And it is not in Home Depot or True Value.
Thank you.