Author Topic: Outfitting the Levin.  (Read 5423 times)

Offline steamer

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Outfitting the Levin.
« on: February 06, 2019, 07:40:02 PM »
I just got a new motor drive,belt and QCTP for this little girl. 
Ill be posting the install and thoughts on getting her running.   
Dave
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Offline b.lindsey

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Re: Outfitting the Levin.
« Reply #1 on: February 06, 2019, 07:55:30 PM »
Did you name her yet?

Bill

Online Jo

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Re: Outfitting the Levin.
« Reply #2 on: February 06, 2019, 08:06:22 PM »
Did you name her yet?

I can tell I might have started a trend  ::)

Jo
Usus est optimum magister

Offline steamer

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Re: Outfitting the Levin.
« Reply #3 on: February 06, 2019, 08:31:28 PM »
Lovely Lucy....of course!
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Offline b.lindsey

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Re: Outfitting the Levin.
« Reply #4 on: February 06, 2019, 10:36:43 PM »
That works!!!

Bill

Offline steamer

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Re: Outfitting the Levin.
« Reply #5 on: February 07, 2019, 01:21:46 AM »
Current state of play

Mounted to a Watchmakers Bench.

the current motor is the traditional Universal with foot pedal.   I find the speed control terrible with any change in load while you try to compensate with a somewhat non linear foot pedal.

It's going!

In it's place, I'm going with an industrial sewing machine Servo motor.   It has a Potentiometer control, and it automatically controls around a set speed, regardless of load.  And at 500 W, it's about 2/3 HP. so Plenty of power for a 50 mm lathe.    The mount will need a bit of work, but it's all there.  The price was WAY cheaper than anything labled Watchmaker ever dreamed of.

https://www.amazon.com/gp/product/B079P8RQRQ/ref=ppx_yo_dt_b_asin_title_o01__o00_s00?ie=UTF8&psc=1

Second.   The Cross slide needs a tool post.   Now I have a lantern one, but I'm waiting for the Cowells QCTP that I just ordered so that I can mount it  ( Thanks for the size sketches Bill, I think itll fit perfect!)



Parts are on the way....but I have a show goal to reach first....but I'm close...so maybe start on some of this this weekend.

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline b.lindsey

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Re: Outfitting the Levin.
« Reply #6 on: February 07, 2019, 01:48:13 AM »
Exciting to see LL close to being back in action Dave. Did you decide on the new handle material yet?

Bill

Offline steamer

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Re: Outfitting the Levin.
« Reply #7 on: February 07, 2019, 01:59:27 AM »
Probably 12L14.    Simple, and easy to machine
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Offline steamer

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Re: Outfitting the Levin.
« Reply #8 on: February 07, 2019, 02:00:53 AM »
Ive drawn up the handle, and now im thinking about how ill make it.
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Offline 10KPete

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Re: Outfitting the Levin.
« Reply #9 on: February 07, 2019, 02:09:57 AM »
That's a beautiful little lathe, Dave. I don't remember ever seeing one before.. :shrug:

I do like that tool post.. :Love:

Pete
Craftsman, Tinkerer, Curious Person.
Retired, finally!
SB 10K lathe, Benchmaster mill. And stuff.

Offline steamer

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Re: Outfitting the Levin.
« Reply #10 on: February 07, 2019, 02:38:48 AM »
That's a beautiful little lathe, Dave. I don't remember ever seeing one before.. :shrug:

I do like that tool post.. :Love:

Pete

Its a watchmakers lathe accepting 8mm collets   Spindle runout is maybe a .0001"....its a nice little lathe.
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Offline steamer

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Re: Outfitting the Levin.
« Reply #11 on: February 07, 2019, 09:34:32 PM »
Motor is here!!!   It's almost as big as the lathe...but I knew that.

I suspect there is a brake on the back side and a contactor.  I'll be ditching that.

Pictures to follow

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
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Offline steamer

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Re: Outfitting the Levin.
« Reply #12 on: February 07, 2019, 09:36:20 PM »
That's a beautiful little lathe, Dave. I don't remember ever seeing one before.. :shrug:

I do like that tool post.. :Love:

Pete

PS   that tool post is 0.75" tall.....  8)
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Offline steamer

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Re: Outfitting the Levin.
« Reply #13 on: February 07, 2019, 11:33:18 PM »
Ok the motor is interesting.     It has a potentiometer that limits the maximum speed.   I has a mechanical brake.   It also has a variable speed sensor.  This sensor is the interesting bit

It's some kind of Hall effect sensor.   It's controlled by the intensity of a permanent magnet magnetic field.   The closer to center of the sensor with this permanent magnet, the faster the motor goes.   This magnet is mounted on the brake arm, so when you want to go fast you move the lever up, disengaging the brake, and bringing the magnet closer to the sensor.   The more you move the brake arm up and away from the brake, the faster the motor goes.   

If you hold the lever up for full throttle, you can adjust the speed with the potentiometer alone.

I don't need the brake, or the lever.  I just want the POT.    So I think the simplest thing to do with it is to place a bar magnet over the sensor there by keeping it full on, and then controlling speed with the pot alone.    I'll also remove the brake, and the perhaps groove the brake wheel for use as an accessory pulley.  Plenty of braketry for a counter shaft mounted on the motor and way to bolt it to the bench.   this will work well!   GOBS of low speed torque all the way up to 3450 rpm.    WAY more than enough power for such a small lathe.   and more importantly, its much smoother power delivery than the AC universal motor.  Its also very quiet.....Much more quiet than the universal motor.
Dave


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Damned ijjit!

Offline steamer

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Re: Outfitting the Levin.
« Reply #14 on: February 07, 2019, 11:37:25 PM »
The motor is a brushed motor by the way.   It comes with a spare set of brushes.   I doubt I'll ever need them in this application though.

Dave

"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!