Hi All,

I'm in need of the pinion for the vertical milling attachment for a Unimat 3 (Part# A3Y 100 070). I'll take a full lever assembly if found.


-T. Jump

Conversely, does anyone have a Unimat 3 vertical mill attachment that can provide measurements of the pinion?

-T. Jump

Hi Peter,

Thank you for this. I feel remiss in that I did not accurately describe the part I'm looking for. I've included a photo below with the pinion circled in red. Measurements I will need for the spline are OD, RD, #of teeth, tooth thickness at pitch, length. For the body I need overall length, OD, and position and width of the slots. I truly appreciate any help with this.?

-Timothy Jump

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Hi Timothy:

I needed a quill handle too, but found a gear in the junk box that would work. It had one less tooth, but still works fine. I think the gear came out of a can opener.

The gear for the headstock quill is 10 teeth, 1 Mod, so a standard metric gear. Usually gears below 12 teeth are adjusted to prevent undercutting the teeth, but for this job they are not. I got some suitable gears from a Chinese supplier, but never got around to using them as my SL went abroad. However I might make up a handle as I have a spare headstock that I might convert into a small pillar drill.

So the gear spec is 10 teeth, 1 Mod, OD 12 mm. I think I got mine from Ebay, item number 166358248864 (in the UK).

Thanks Keith! This will help me identify a spline blank if I need to fabricate my own pinion.

Cheers,
Timothy Jump

If you’re going to use the fine feed attachment on the U3 milling head you will need to be able to fit the additional small cog (part of the fine feed adjustment) onto the lever.

The cog is held captive by the short end of the thin ‘handle’ locating in a slot in the cog. You would have to examine the lever in some detail to get that correct.

Just something to bear in mind if considering manufacturing the lever from scratch.

Thanks Peter. Good to know.

Cheers,
Timothy Jump

Thank you Keith for getting me the spline specs. What I still need are length dimensions. I've attached a rough drawing of the Unimat 3 vertical milling attachment pinion with the length dimensions marked in both blue and red arrows. For the blue arrows I need the edge-to-edge lengths. For the red arrows I need the edge to hole center lengths. I can also use the OD of the body of the pinion, the OD of the handle rod, the overall length of the handle rod, and the length of the protrusion of the handle rod short end (for accommodating the fine feed gear). I appreciate any help I can get, finalizing these measurements.


Thank you,
Timothy Jump

?

If you don't worry about making a replica of the original Unimat one, and their construction did vary, you can do it all without dimensions apart from knowing that the main shaft is 12mm diameter, same as the OD of the gear. Also the versions I have used did not have the circlip groove. Some had the gear teeth cut directly on the shaft and others looked like a gear had been fitted. There's no reason why your]s shouldn't be different so long as it does what you want.

Take a bit of 12 mm diameter steel and turn down enough of one end to poke through the gear and some way further. Offer this into the hole in the headstock and see how it looks. Trim off the end of the shaft until the gear engages nicely with the rack on the quill. I suspect you might not need anything sticking through, but just take a look to make sure. Fix the gear on the shaft - I would use Loctite or an equivalent to get a solid fixing. Grub screws will not be good enough. Then trim off the shaft to a sensible length, with about 30 mm protruding above the headstock. Face and chamfer this end. Drill a 6 mm hole at an angle of about 15° and fit a bit of 6? mm steel bar about 100 mm long - fix it with Loctite. All fits should be close, but not? press fit, unless you can make them a really tight fit, in which case you won't need any Loctite. Drill and fit a 20 mm plastic ball on the end. Job done. Dimensions could vary according to what feels comfortable for you.

At some stage consider what surface finish you want. I would use chemi-blacking. Just do it before the plastic ball goes on.kee

Sorry for my first replay, I misunderstood Timothy.
Here is the dimension of my part, as it should be called in English, and a photo of it.?

Peter Nyffeler

The 'handle' is held in place by a grub screw at the end of the pinion, I wouldn't glue it if you ever want to be able to use the U3 Fine Feed Attachment (EMCO part number 151.110).

?

Thank you Keith, Peter_B and Peter_N. This is very helpful and I should be able to fabricate one of these per the need.

Cheers,
Timothy Jump

Sorry, I was thinking of my old SL and didn't notice it was for the U3. Maybe more accurate dimensions will be required for that. Even so, a lot of it could be improvised according to what you want to do. Somewhere in the depths of my garage I have a U3 style milling column which will need a complete rebuild. I'll see what I learn from that.

I just got a 12mm pinion blank, but to my surprise it does not fit into the Unimat 3 Vertical Milling Attachment. I measured the opening in the milling attachment and it comes in at 11.8mm. So now I'm trying to determine if the actual pinion for the Unimat 3 is something other than 12mm OD. If someone could measure the opening in their Unimat 3 Vertical Milling Attachment and verify if it is bored to accept 12mm, or if it is less than this, it would be a great help.

Thank you,
Timothy Jump

Hello Timothy,?? I measure my U3 at 12.03 for the hole and 11.95 on the pinion (tooth tip to tip) with 11.97 on the pinion shaft.?? Hope that helps!?? Rgrds,?? Richard.

Thanks Richard. With your numbers I moved forward with a bit of polishing on both the hole and the shaft. All is now fitting quite nicely.


Cheers,
Timothy Jump