Re: Plan for chuck plate please

#54675

My 4-jaw chuck has a back plate with 4 holes, bolt pitch circle diameter
is 26mm.
My 3-jaw chuck has a back plate with 3 holes, bolt pitch circle diameter
is 23mm.
Screws are M4

Roman

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On 2020-03-31 12:01 p.m., John Hutnick wrote:

Doesn't anyone known the bolt circle diameter or is it in some file?

-------- Original message --------
From: jk_neus <jimk@...>
Date: 03/31/2020 11:29 AM (GMT-05:00)
To: Lionel <liolegall@...>, [email protected]
Subject: Re: [Unimat] Plan for chuck plate please

Try measuring across existing features - For example Measure the distance from the outside edge of the flange to the outside edge of the screw,then finding the radius of the screw and of the flange. Using the above I getScrew to flange side - 23.86 mmFlange radius 8.86 mmScrew radius 1.9023.86 - 8.86 - 1.90 gives a bolt hole radius of 13.1 mmJim Korman

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Re: SL U-90 Motor Wiring

#54674

开云体育

Hello Lio:

I use my drafts person's electric eraser to clean commutators. I use the gray eraser meant for removing ink.

Notice the grind marks from dynamic balancing. A better quality motor.

Carl.

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5 : Take the opportunity to gently clean the collector :
?

Re: Plan for chuck plate please

#54673

Thank you very much to all !
--
Lio, France - Unimat SL x 3

Re: SL U-90 Motor Wiring

#54672

--
Lio, France - Unimat SL x 3

Re: SL U-90 Motor Wiring

#54671

Something missing ?

Re: SL U-90 Motor Wiring

#54670

1 : Remember to mark the different parts to facilitate the reassembly :

???

2? : Since it's open : check the bearing :

?
3 :

the hole where the small screw is placed which holds both the small red wire (from green capacitor) and 
the small curved part which fixes the large wire which leaves outside

4 : the green old capacitor (1974 !) >> Question : Can it be remove without affecting the operation of the engine ???
>>> my U90 motor blew the house electric meter !!!
(the rotor seems ok...)

5 : Take the opportunity to gently clean the collector :

?

6 : check the wires...

7 :

here we see the small hole where the small screw is placed. 
This hole is sometimes hidden by the engine label...

--
Lio, France - Unimat SL x 3

Re: Plan for chuck plate please

#54669

开云体育

Hi Pat:

As a tool maker we used special center punches called Transfer Punches:

Very handy, never hit them hard, just enough to leave a prick. Then I use my 3/4" diameter center punch to enlarge it to a 1/4" crater.

Being a nerd, I just had to have more than one set, so I have fractions to 1/2", 1-60 numbers and metric. I don't have the 0.5" to 1" set, yet.

Carl.

On 4/1/2020 1:13 AM, pat goodyear wrote:

Show quoted text

So here is how I would do the finish and holes, thread the center with the proper relief. ?Thread it on the spindle, face it square and to fit the chuck recess. ? Put it in the recess then Using a center punch through the chuck locate the first hole, drill and tap it, install one screw, then using a drill bit that just fits inside the threads drill starter holes, remove and finish. ? My chucks that have facing plates have an index recess. ??

pat

Re: SL U-90 Motor Wiring

#54668

I would like photos please.? Regards, John Hutnick

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On Wed, Apr 1, 2020 at 10:28 AM Lionel <liolegall@...> wrote:

Hi
My U90 motor is currently open : if you want photos : ask !
--
Lio, France - Unimat SL x 3

Re: SL U-90 Motor Wiring

#54667

Hi
My U90 motor is currently open : if you want photos : ask !
--
Lio, France - Unimat SL x 3

Re: Plan for chuck plate please

#54666

So here is how I would do the finish and holes, thread the center with the proper relief. ?Thread it on the spindle, face it square and to fit the chuck recess. ? Put it in the recess then Using a center punch through the chuck locate the first hole, drill and tap it, install one screw, then using a drill bit that just fits inside the threads drill starter holes, remove and finish. ? My chucks that have facing plates have an index recess. ??

pat

Re: SL U-90 Motor Wiring

Aron

#54665

When I restored mine late last year I had to do a lot to the motors internals to bring it back to spec...

The screw on top of the case at the rear is what I’m on about, inside there is a bit of metal “u” shape that that screw and internal nut lock holds it in place to keep the power cable away from the rotor, subsequently the earth cable, and the brushes housing connecting cable also wraps around the screw, when tighten it holds all the earths ( brushes and mains) while the u shape grips the power cable, I hope that explanation helps more... if you no longer have the screw there it’s an easy thing to replace, the U90 motor dose not have an air vent, it’s a limited run motor (8 mins of use to 10 min cool down) only the unimat 3/4 came with the air cooled fan rotor.

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On 31 Mar 2020, at 22:55, GCS <accounts@...> wrote:

?Hi Aron,

The only bolt I have is the cable guide, where it enters the case. I guess I can loop it around there too.
I'm wondering if the one you're talking about got cut away when the previous owner cut, what I only can assume is an air vent, into the case?..

Cheers,
Geoffrey

image0.jpeg

Re: What do you guys make?

#54664

Hi,

I make fountain pens with mine. Was told it'd be too small but you can just about get it to work with some extra thought.
I was forever having issues with the run out though, and since I believe that it has been fairly abused in the past, I switched to something larger - also to save some time. I do still plan on using the unimat for the shaping though, it seems a very comfortable size to shape small items by hand with the t rest.

I've got some examples on my ?if anyone is interested.

Recently tentatively used it as a mill too. (I haven't got the spindle raiser spacer or I'd have used the various saw attachments at some point - should be easy to make though, especially now that I've got a larger lathe to help you. :-) )
Was daydreaming a little today and realised that one could convert a unimat into a router fairly easily too, so depending on how long this whole situation lasts I might end up doing that if I get done with all my other projects!

Re: SL U-90 Motor Wiring

#54663

Hi Aron,

The only bolt I have is the cable guide, where it enters the case. I guess I can loop it around there too.
I'm wondering if the one you're talking about got cut away when the previous owner cut, what I only can assume is an air vent, into the case?..

Cheers,
Geoffrey

Re: Plan for chuck plate please

#54662

I can measure tonight.

Show quoted text

-----Original Message-----

Doesn't anyone known the bolt circle diameter or is it in some file?

Re: Plan for chuck plate please

#54661

What about making the backplate fit the chuck snugly and then use a transfer punch through the hole in the chuck.? Your screw holes are now marked.? Drill and tap for M4 screws

Ed

Re: Plan for chuck plate please

#54660

开云体育

Doesn't anyone known the bolt circle diameter or is it in some file?

Show quoted text

-------- Original message --------
From: jk_neus <jimk@...>
Date: 03/31/2020 11:29 AM (GMT-05:00)
To: Lionel <liolegall@...>, [email protected]
Subject: Re: [Unimat] Plan for chuck plate please

Try measuring across existing features - For example

Measure the distance from the outside edge of the flange to the outside edge of the screw,
then finding the radius of the screw and of the flange. Using the above I get
Screw to flange side - 23.86 mm
Flange radius 8.86 mm
Screw radius 1.90

23.86 - 8.86 - 1.90 gives a bolt hole radius of 13.1 mm

Jim Korman

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20200331_100312.1.jpg

20200331_100248.1.jpg

Re: Plan for chuck plate please

#54659

Try measuring across existing features - For example

Measure the distance from the outside edge of the flange to the outside edge of the screw,
then finding the radius of the screw and of the flange. Using the above I get
Screw to flange side - 23.86 mm
Flange radius 8.86 mm
Screw radius 1.90

23.86 - 8.86 - 1.90 gives a bolt hole radius of 13.1 mm

Jim Korman

Re: What do you guys make?

#54657

Piano?

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On Tue, Mar 24, 2020 at 02:43 PM, Unimat Matt wrote:

I was just wondering, what do you guys actually make using your Unimat machines?

I am more of a collector myself but I really should put them to use. (I?have a Unimat SL, Emco 3 and an Emco 3 milling machine.)?

Now my country, like many others is on lock down. I've been looking for a small project I can complete in my home. Any suggestions?

PS. Im not interested in steam engines. ?