Lathe improvements?

[Niels AbildgaardParticipant @nielsabildgaard33719]

It has not been a cheap journey looking for the ultimate living room lathe, but quite fun.

Somehow I feelt a little fooled when I found this :

210 lathe 38mm spindle

[Niels AbildgaardParticipant @nielsabildgaard33719]

and this:

700$ ideal lathe?

Edited By Niels Abildgaard on 02/10/2019 19:38:42

[DiogenesParticipant @diogenes]

..that is cheap, BUT..

..yours is built with personally-selected components that have been hand-fitted to meet your own specifications for performance, durability, and accuracy that you know to be absolutely true, because you made it yourself.. ..you can't buy that for $700..

[Niels AbildgaardParticipant @nielsabildgaard33719]

Posted by Diogenes on 03/10/2019 08:36:02:

..that is cheap, BUT..

..yours is built with personally-selected components that have been hand-fitted to meet your own specifications for performance, durability, and accuracy that you know to be absolutely true, because you made it yourself.. ..you can't buy that for $700..

Thank You for support and my journey up til now has cost more than 700$ and have been enjoyable.

The original 210 spindle has a hole of 21mm and sits in two 30mm inner bearing rings.The holes in headstock is 62mm.

If we asume that the Dijin factory are boring 68mm headstock bearing seats, they can buy 32909 bearings and make spindles 45 mm outside.

Bending stifness of beams is a power four(Three?) function of diameter.

The standard 30/21 minilathe spindle stifness is 3*3*3*3-2.1*2.1*2.1*2.1 =62 something.

The new 45/38mm is (410-209=201) or more than three times more rigid

Why did Boxford not do something like it that?

[Howard LewisParticipant @howardlewis46836]

Niels,

You work is awesome. Your machine now bears NO relationship to what arrived on your doorstep.

You have made a very good silk purse, out of what may have been a sows ear..

Please accept my apologies if the English vernacular is strange to you!

Fantastic work, and a machine of which you can be really proud.

Howard

[Niels AbildgaardParticipant @nielsabildgaard33719]

Posted by Howard Lewis on 03/10/2019 16:15:24:

Niels,

You work is awesome. Your machine now bears NO relationship to what arrived on your doorstep.

You have made a very good silk purse, out of what may have been a sows ear..

Please accept my apologies if the English vernacular is strange to you!

Fantastic work, and a machine of which you can be really proud.

Howard

Hello Howard and thank You for kind evaluation.

I have had five chinese lathes through my hands within the last two years.

A 280 that was much to heavy to handle for an old man.

It is by a friend and I use it for cast iron,brass and big jobs.

A 250 that I use now

A 210 very cheap from Amazon that faced convex and given away

A 180 from Amazon that crashed down before entering my house and I got a full refund thanks to Amazon

A Kaimac 180 that is the main subject here and is at my son and is appreciated but can be improved (he claims).

I never measured the crasher 180 but the four others have been very,very good when tested for roundnes and cylindritis or watchmacall it.

Facing was very,very sligthly concave on all but the cheap 210 that was obscene convex.

They have all been better out of box than the My,Boxers I have known and it can have something to do with modern laser control and alingnment of the machine tools in China.

It will be worth watching if the Dijin factory can make a good run with the 38mm bore 210 lathe.

[Niels AbildgaardParticipant @nielsabildgaard33719]

It is getting out of this world.

The 210 lathe with 38mm bore was assumed to have bearings 45mm bore ,68mm outside and15mm wide .

It has not

 

210 lathe with 30209 bearing

 

These bearings are 45mm inside ,85mm outside and 22,5mm wide.

That means I can put in 32912 bearings (60 mm bore,85 outside and 17mm wide) and thus have a 50mm through bore spindle.

Please help me with some arguments for this new toy I want.

I found the picture here

 

Gun nuts galore

 

The thread has some interesting  change gear calculators.

This will be nessecary as spindle gear must have at least 70 teeth.

 

 

 

 

Edited By Niels Abildgaard on 27/10/2019 12:18:29

Edited By Niels Abildgaard on 27/10/2019 12:20:19

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Niels Abildgaard on 27/10/2019 12:13:49:

[…]

210 lathe with 30209 bearing

These bearings are 45mm inside ,85mm outside and 22,5mm wide.

That means I can put in 32912 bearings (60 mm bore,85 outside and 17mm wide) and thus have a 50mm through bore spindle.

Please help me with some arguments for this new toy I want.

[…]

.

Just go for it, Niels

You are sure to find a use for 50mm bore sometime.

MichaelG.

[Niels AbildgaardParticipant @nielsabildgaard33719]

Posted by Michael Gilligan on 27/10/2019 12:21:08:

Just go for it, Niels

You are sure to find a use for 50mm bore sometime.

MichaelG.

Thank You for encouragement.

I will find an excuse.

It can maybe be had here

Big-bore monsterlathe

 

I

Edited By Niels Abildgaard on 27/10/2019 17:50:11

[DiogenesIIParticipant @diogenesii]

Ha, Niels, this must be an even more temping project now than it looked at the beginning of October – you will need one of these;

https://www.ebay.co.uk/itm/MT6-MORSE-TAPER-LATHE-DEAD-CENTRE-HARDENED-GROUND-Quality-Heavy-Duty-Tool-/132174226697

Have fun

D

[Niels AbildgaardParticipant @nielsabildgaard33719]

Posted by DiogenesII on 27/10/2019 19:02:03:

Ha, Niels, this must be an even more temping project now than it looked at the beginning of October – you will need one of these;

https://www.ebay.co.uk/itm/MT6-MORSE-TAPER-LATHE-DEAD-CENTRE-HARDENED-GROUND-Quality-Heavy-Duty-Tool-/132174226697

Have fun

D

I will try to treat it as fun and not as the utmost importance to humanity,but it is difficult.

Morsecones was classified as so last century by the late John Stevenson and I tend to agree after having met ER collets.

A very preliminary dimensional sketch showing the 92mm recess machined in situ.This can then cary a wast array of chucks,faceplates and ER collet plates.

Edited By Niels Abildgaard on 28/10/2019 08:14:08

[Niels AbildgaardParticipant @nielsabildgaard33719]

The sketch from 28 oct was my plan for making a small envelope,oilfield lathe with a spindle bore of 50mm.

I did buy a WM210* 400 with 38mm bore lathe and took it apart.

Quality on spindle and chuck was abyssmal.

I did not throw it on scrapheap but sold it very cheap after having informed him clearly what was wrong.

He lives 20km from here and lathe is running.He have agreed to let me try a bighole spindle if I ever finishes such one.

Edited By Niels Abildgaard on 19/01/2020 20:10:44

[Niels AbildgaardParticipant @nielsabildgaard33719]

Intention is to copperbraze some almost finished flanges unto some thin-walled steel pipes of good quality.

And then see if my WM250 lathe can make it.My WM250 lathe has the same 62mm bearing holes like almost all other chineese and austrian mini lathes.

Thats to small.

I tried to part of some 100mm steel and that was not possible.

75mm steel worked but was neither easy or nice.

There is really a need for bigger hobby lathe spindles.

The monster WM210/38 bore lathe came with two 45/85/22mm spindle bearings and can then have a 38mm bore.

Slim bearings (32912 or 60/85/17mm) can hold a new homemade spindle with 50 or51mm bore.

It spoils my sleep that I can also fit bearing/spindle set as shown

The lower spindle half is the standard 45/85/22mm bearings and spindle from China.

The upper half shows cantilevered bearings of 75/105/20mm and spindle bore can easily be 65mm.

Edited By Niels Abildgaard on 19/01/2020 20:55:10

Edited By Niels Abildgaard on 19/01/2020 20:57:56

[Niels AbildgaardParticipant @nielsabildgaard33719]

The cantilevered bearing scheme can also be applied to my very well made WM250 lathe with its lousy 62mm bearing bores.

Spindle outside diameter can be 55 mm and hole through 45- 46mm.

.

This is better than all other lathes with 62mm bearing holes were it must be less than 40mm.

What does readers think will be max value for mankind?

Edited By Niels Abildgaard on 19/01/2020 20:53:00

Edited By Niels Abildgaard on 19/01/2020 20:59:45

[Niels AbildgaardParticipant @nielsabildgaard33719]

In spite of Corona it is still pleasant to show the Chinese how lathes can be improved.

My 210 lathe with 38mm hole will get a 50mm hole spindle that is made on my new 250 lathe with 27mm hole and MC4.

I made two copper-brazed rawlings and they were turned on the 250 as close to headstock as possible.

first picture shows one of these new spindles in place but waiting for new bearings.

Edited By Niels Abildgaard on 29/04/2020 21:12:25

Edited By Niels Abildgaard on 29/04/2020 21:14:30

[DiogenesIIParticipant @diogenesii]

Good to see that you are back, and have been doing.. Are both of these spindles to be fitted in "inboard"/standard bearings?

..and I am intrigued what is held in that battleship-shaped toolholder..

[Niels AbildgaardParticipant @nielsabildgaard33719]

Posted by DiogenesII on 29/04/2020 22:12:48:

Good to see that you are back, and have been doing.. Are both of these spindles to be fitted in "inboard"/standard bearings?

..and I am intrigued what is held in that battleship-shaped toolholder..

 

Two raw brazed items were made because I know my ability to make scrap.

I did not (yet)

The 210 big hole lathe will look something like this

 

 

Edited By Niels Abildgaard on 30/04/2020 08:21:49

[Niels AbildgaardParticipant @nielsabildgaard33719]

The Battle Ship is a tangential holder for 2 times 2 mm carbide.

 

I use it for more than 90% of my swarf.

On a clear day I have line of sigth to New York

Edited By Niels Abildgaard on 30/04/2020 08:27:58

Edited By Niels Abildgaard on 30/04/2020 08:28:54

[Niels AbildgaardParticipant @nielsabildgaard33719]

The 210 big hole lathe is so miserably manufactured that I will ask it to leave house when it functions.

My new 250 lathe on the other hand is nicely made and can stay.

It uses two 45-75mm tapered bearings and I will make a new spindle looking something like this:

[DiogenesIIParticipant @diogenesii]

Thank you posting the extra tool photo's, Niels – I like that design very much..

You have a new 250? ..with bigger bearing housings?

[Niels AbildgaardParticipant @nielsabildgaard33719]

Posted by DiogenesII on 30/04/2020 21:51:19:

Thank you posting the extra tool photo's, Niels – I like that design very much..

You have a new 250? ..with bigger bearing housings?

 

New York here I come

If You want one for your Hobbymat let me know and we start a new thread.

My first chineese 250 lathe had 30/62mm  bearings and MC3.

MY present 250 has 45/75 and MC4 in nose.

This can be changed as shown without changing sacrosant chineese cast iron.

Edited By Niels Abildgaard on 01/05/2020 08:55:16

[DiogenesIIParticipant @diogenesii]

The significance of having a line of sight to NY only struck me today (a dull day at work..) – the Dover Strait makes a very narrow window to look through.. Now I see where you are, I understand how Stuyvesant must have got there.. ..not even any turns to make..

I'm always interested in tools that sit firm on a slide with almost no overhang, as everyone should be.. I think I have it figured enough for my own experimentation, for which I thank you again. I'm sure that if you wanted to post further details, others might be interested too, but of course I don't wish to impose on your welding & turning time – mankind is waiting..

[Andy PughParticipant @andypugh44463]

Posted by Niels Abildgaard on 02/10/2019 18:46:37:

It has not been a cheap journey looking for the ultimate living room lathe, but quite fun.

I just found this with Google, after being challenged to find any one other person that can use the phrase "living room lathe". So thanks for making me not wierd.
I might as well post a photo of mine… https://photos.app.goo.gl/U2X3SLH3YBWLkehz8

[Niels AbildgaardParticipant @nielsabildgaard33719]

Posted by Andy Pugh on 11/06/2020 13:31:49:

Posted by Niels Abildgaard on 02/10/2019 18:46:37:

It has not been a cheap journey looking for the ultimate living room lathe, but quite fun.

I just found this with Google, after being challenged to find any one other person that can use the phrase "living room lathe". So thanks for making me not wierd.
I might as well post a photo of mine… https://photos.app.goo.gl/U2X3SLH3YBWLkehz8

That is the spirit

Servant,dogs and children not allowed near the lathe

[Niels AbildgaardParticipant @nielsabildgaard33719]

A box came this morning from Pilzen with a 210/38mm hole lathe bought for 780€ via Amazon de.

Two days late in Corona time is OK.

It got power and ran very well and everything else was OK and well made.

 

An hour later it looked  like this:

Plan is to put a bigger spindle in and power it with a 1.5kW/3000rpm sewing machine motor.

I am still looking for a simple yardstick  of hobby lathe performance.

Edited By Niels Abildgaard on 20/11/2020 18:41:19

Edited By Niels Abildgaard on 20/11/2020 18:41:50

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