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Restoring old lathe

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Dominik Pierog

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Hello.

I'm finishing restoring old 1973 woodturning lathe.
Need setup chuck and tailstock also chisels and some kind of sharpening system.

My spindle is M52 thread with morse 4
Biggest turning diameter 400mm, longest 1250mm
Back spindle part have unknown thread with max diameter 100cm
I know that standard is M32 so I need order adapter.

For now tailstock morse is unknown, I have original rotating insert so one day machine shop will check it.

1.jpg
2.jpg
 

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leisurefix

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I searched on www.lathes.co.uk for Gomad but nothing on there, is there any other manufacturer details? If so, search on that web site, is excellent source of information.
Secondly, that is an engineering lathe rather than woodturning lathe. You can use it for wood turning, but will need to remove the carriage, then get a toolrest banjo, and toolrest (www.toolpost.co.uk sell banjos). Also, a 3 jaw chuck is not suitable for holding wood. You could buy a second hand Axminster super precision, or Toolpost versachuck chuck, and then get a ISO standard back plate with the appropriate screwthread for your lathe made.
It looks a very substantial lathe, but I do wonder whether you may be better selling this when you have finished the excellent looking restoration, and buying a dedicated woodturning lathe instead.
Cheers, Andy
 

TFrench

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I think its a patternmakers lathe Andy - there's a toolrest banjo on the floor. A lot of Wadkin RS's came with a cross slide.
Dominik - you won't find a standard chuck in that thread. As Andy said, you will need to get a backplate machined to fit a chuck. Alternatively you could get an adapter made to get from the M52 thread to a more common M33x3.5 which would give you a lot of standard options.
 

Alpha-Dave

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leisurefix":4ark3c4b said:
Secondly, that is an engineering lathe rather than woodturning lathe. You can use it for wood turning, but will need to remove the carriage, then get a toolrest banjo, and toolrest (http://www.toolpost.co.uk sell banjos).
I suspect it is actually a woodturning lathe, but a more speciality type of ‘pattern maker’s lathe’ that would have been used to make the wooden forms that then made the sand moulds to make cast iron. They often had to repeatedly make straight parts so had the ‘engineering’ style mobile carriage. There is a banjo on the floor in the 3rd photo of the restored set.
The Wadkin RU lathe (a true monster) had similar features.

Great restoration!
 

leisurefix

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Thanks both for highlighting the banjo in one of the pictures. I saw the lead screw & carriage, and didnt look any further in enough detail.
Andy :D
 

Dominik Pierog

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leisurefix":2tj8yoh3 said:
I searched on http://www.lathes.co.uk for Gomad but nothing on there, is there any other manufacturer details? If so, search on that web site, is excellent source of information.
Secondly, that is an engineering lathe rather than woodturning lathe.
Hello

I contact with company, but they lost their archives after end of soviet Poland occupation 1945-1989
https://www.youtube.com/watch?v=_F3Ink4onqM
There is copy of few pages from manual, but without drawings and some details.

Its woodworking and soft metals lathe for workshops, hobby shops and model making. (due the manual)
Almost complete lathes.
1.jpg
2.jpg


TFrench":2tj8yoh3 said:
I think its a patternmakers lathe Andy - there's a toolrest banjo on the floor. A lot of Wadkin RS's came with a cross slide.
Dominik - you won't find a standard chuck in that thread. As Andy said, you will need to get a backplate machined to fit a chuck. Alternatively you could get an adapter made to get from the M52 thread to a more common M33x3.5 which would give you a lot of standard options.
Yes there are 2 banjos one for extra attachment for turning diameter 100cm and standard bench one.
Also I think of order morse taper no 4 adapter to M33 > spindle have MK-4 taper.


Alpha-Dave":2tj8yoh3 said:
I suspect it is actually a woodturning lathe, but a more speciality type of ‘pattern maker’s lathe’ that would have been used to make the wooden forms that then made the sand moulds to make cast iron. They often had to repeatedly make straight parts so had the ‘engineering’ style mobile carriage. There is a banjo on the floor in the 3rd photo of the restored set.
The Wadkin RU lathe (a true monster) had similar features.
Great restoration!
Its more like universal for hobby shops. The sleds are not so great build also not thread making. Backlash is insane I add movie.

leisurefix":2tj8yoh3 said:
Thanks both for highlighting the banjo in one of the pictures. I saw the lead screw & carriage, and didnt look any further in enough detail.
Andy :D
There no lead screw is toothed gear slat(???) this stuff>


Paint remove
https://www.youtube.com/watch?v=TL2hDnspG2k
Some mechanic
https://www.youtube.com/watch?v=QCVjx4N3abM
Painting
https://www.youtube.com/watch?v=5_TcOhM0src
Repair gears
https://www.youtube.com/watch?v=E6j4fMOE-tA
Restore speed reducer 1: 1 and 1: 1/4
https://youtu.be/blYiGCx5lIw
https://www.youtube.com/watch?v=UdRHAmMmgGA
Engine
https://youtu.be/wKTwxoIofkg
Carriage sped controller > 0,8mm per rotation and 1,5mm per rotation
https://www.youtube.com/watch?v=i-NG028ncAo
Lifting a 800kg frame, also I lift it for made floor.
https://www.youtube.com/watch?v=HjTbn8p3R6U
Spindle
https://www.youtube.com/watch?v=dVoqTKMuJ2w
Today progres
https://www.youtube.com/watch?v=k5BZ_ah0ePg

Brain 3 phase(in/out) 4kW inverter
brain.JPG


Also I need calculate reduction speed rates because i need to install new set of belt wheels. It was cheaper to order new wheel(somebody stolen parts from lathe)
 

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CHJ

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Dominik Pierog":3uml70bf said:
.......

And what is a drawbar M12 ?
If you are using Morse Taper fittings in the headstock they need to be secured in place by a suitable threaded rod passing through the headstock spindle. (basically bolted in place with a long bolt)

This is to ensure that the taper does not let go under vibration and come loose.
Make sure Headstock Morse taper fittings have a suitable threaded socket in the rear.

I'm very jealous of your Pattern Makers Lathe, for my style of turning output it is the ideal tool.
 

Dominik Pierog

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2 weeks pass.
Gomad (1).JPG


Finish wiring inverter.
Made control panel with RPM meter. Now read RPMs directly from spindle.
Tool box on lathe.
Gomad (3).JPG

Fast change tool holder on sleds.
Cover for sleds and moving plywood container for waste.
sroba 3.jpg

Gomad (14).JPG


Add drill chuck for tailstock. I need full assemble and tune up it.
Gomad (2).JPG

Gomad (11).JPG


Small and big tool rest.
Gomad (13).JPG


Place for missing piece of big tool rest.
Gomad (10).JPG


Pulley system. Marked gear reducer I can select 1/4 or 1/1
Gomad (5).JPG


So thanks inverter engine have min RPM 300, max is 3620

With gear reduction 1/4 it gives
1 set of pulleys min 20 RPM max 250 RPM
2 set of pulleys min 35 RPM max 428 RPM
3 set of pulleys min 56 RPM max 680 RPM
4 set of pulleys min 84 RPM max 1012 RPM

Without gear reduction 1/1 it gives
1 set of pulleys min 80 RPM max 1012 RPM
2 set of pulleys min 140 RPM max 1712 RPM
3 set of pulleys min 224 RPM max 2720RPM
4 set of pulleys min 336 RPM max 4048 RPM
 

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Dominik Pierog

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I made lever for gear reduction and drill chuck for tool holder. These parts look good thanks to the angle grinder. Poor turning quality due to slack on spindle and saddle.
123 (2).JPG


I made it because tailstock is too hight like 0,7mm.... and in someone workshop someone for 30 year made eccentric holes....
tokar (3).JPG


The lateral clearance of the spindle has a quality of about 0.1 mm. The quality of longitudinal turning is a massacre, a lot of grooves. I will exchange new ball bearings for new conical bearings. Because of this I have to dismantle the spindle which is annoying. So I decided to complicate matters more ... I will raise the spindle by about 16cm.
So I bought materials, profiles and steel rollers. I am now waiting for the delivery of cutting tools. The ones I bought are too small for this lathe.

I thicken this parts > shims for tailstock; drilling and taping them. Next mount on lathe. 1 and 2(two sides of this same piece) was learning but 3 have decent quality.
123 (1).JPG
123 (3).JPG


Bolt in lathe chuck
gomad (31).JPG
 

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RickG

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Don't know if this helps, but someone I know had an SK100 chuck made by Axminster to suit an odd sized thread on a lathe he has. Maybe they can help you?
Otherwise a reducer to M33 would be good I guess.
 

Dominik Pierog

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RickG":bxbotdxp said:
Don't know if this helps, but someone I know had an SK100 chuck made by Axminster to suit an odd sized thread on a lathe he has. Maybe they can help you?
Otherwise a reducer to M33 would be good I guess.
I purchase M33x3,5 thread die. Cost like 10F ...

My renovation projects stop because I can't buy outside jaws form my 3 jaw chuck(from 1975).
Thread of jaws is something insane beyond modern norms.


Also threads for slide's screw is TR20x2mm where modern screws have TR20x4mm
download/file.php?id=88283&mode=view
 

Dominik Pierog

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New parts.
Mising base for big banjo from left side of lathe

Spindle base plate +16cm



Tailstock part.
 

TheTiddles

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I have no space for a machine like that nor do I make things that would use it... but now I want one.

Aidan
 

MusicMan

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Thanks for a great WIP. That magnificent beast is coming along very well!
 
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