Member postings for Niels Abildgaard

A picture of where and what 40mm will open a torrent of wise guy comments.

Lovely parting off without drama and tears.

What was diameter of subject?trying to calculate feed/rate that is on the low side for my taste.

918 lathes are wildly underated here and go between 250-500 £.Must have one.

Very nice video.

Next must be a parting off video.

That is where wheat and chaff are sorted.

Can we have some newer information on ideal motor torque,rpm and gearing?

I want it on both axes.

Thank You for experimenting and finding the way.

Can we please have a link with picture?

Have never seen it but it sounds OK.

My best source of steel is the local farm machine repairer.He buy black mild steel in plate,bars etc for ca 1,3 £ per kg.Made from recycled scrap.

I have seen his bandsawblade destroyed by a short piece of 5mm spiral drill.

Carbide and he was concerned.

It does not melt in furnace and is small enough to defy separation by density.

The people at workshop was told to be carefull when throwing away carbide.

Edited By Niels Abildgaard on 23/07/2020 13:59:24

These people also has nuts (Mutter) and trapez 16 * 3.

Tr 16 * 3 and nuts

I had sworn that I would not allow a Boxford in my house and was looking for suitable WM250 headstock to make two big spindle experiments.

My WM250 machine with MC4 is a very nice machine.

By accident a cheap model A 19509 Boxford saw me and followed home.

It has been in school since 1966 and has seen very,very little  use.

The complete drive system with a 0.5hp three phase Crompton will leave as will all the rotating parts in headstock plus gearbox and (imperial) leadscrew.

The spindle scheme to be tried first is this.The lines are 10mm apart.Bearings 32910 and 32916

Edited By Niels Abildgaard on 04/07/2020 15:34:47

That is an acceptable box of chineese lathe kit You have got there says a man who drove an Imperial Boxford of latest model on scrapheap in anger.

Awesome 918 Lathe ,but why not a bigger spindle?

Put  same kind of motor on the leadscrew and tell us all what size motor.Please?

If You do not need the ultrafine longitudinal feed from gears anymore it will be easy to put in a much stiffer spindle.

It is the gearwheel on spindle that is a little tricky by monster-spindles and very fine feeds.

Edited By Niels Abildgaard on 28/06/2020 18:09:10

Design for improving lathes with 62mm bearing holes.

There is a scrap headstock not far from here but the owner want silly money

A great step forward for the church of 9*18 size lathes.

The first motor You showed had a torque rating of 0.15Nm

First guess

What will You now recomend and what max rpm?

My lathe is a WM250 550 or very close to Yours sizewise.

As a former Myford owner I would buy a new modern lathe instead.

Have a look at a Sieg C4 from Arceuro as example.

If You buy the Myford there will be constant pressure for telling Yourself and everybody else how good a tradesman You are and that it was deal of the century.

The Sieg thing is more silent,more accurate under load,more wear resistant,bigger hole in spindle ,power cross feed ,(My former Boxford has it and I miss it) and not a lot more expensive.Sell one or two of the grandchildren to cover the 400 exstra £ and enjoy.

Edited By Niels Abildgaard on 22/06/2020 13:53:52

You are wellcome.

You can always up speed and reduce deepth of cut.Try if You can beg or steel a case-hardened piston pin from a moped or lawnmover repairman.You will be astonished for surface look in the hardened zone but beware of swarf.

Hello Diogenes and congratulations on having made a well-working TanTool.

Is there some thoughts on vertical level of clamping screw?

I put them as close to base as possible to even clamping force over more of bit-bore.

Edited By Niels Abildgaard on 20/06/2020 10:05:13

My former Boxford A lathe tried different motors and the best by far was a good VFD and a 6 pole 1.1 kW.

Lathe is protected by the belt drive.If You do something stupid belt slips.

A short video showing same good VFD plus a four-pole .75kW motor.

Very nice but 6 pole 1.1kW was better but my space was limited in a new flat after change of home.

Boxford VFD

One of the ultimate limits to power from combustion engines is that air/fuel cannot pass a hole/port/valve faster than sound speed.

The relation of maximum port area to cylinder volume is helped by being a small cylinder.

Let us say a worldbeating 2.5ccm engine has a port area of max 50 square and can pass air /fuel that gives 2.5 horsepower.

If we enlarge all linear dimensions by 1.38, we get 6.5 cubic cm and get 95 square mm port in very good accordance with the mentioned power of 5hp for a 6.5 cubic engine.

It is the cube/square law at work.

Edited By Niels Abildgaard on 13/06/2020 10:22:52

Edited By Niels Abildgaard on 13/06/2020 10:23:48

That is the spirit

Servant,dogs and children not allowed near the lathe

What is Your difficulty with depth of cut being either radial or axial ?

Some videos here show both axial and radial .

My feeling is that a 2mm square can cut 1.9mm deep and a 3mm round only 1.5 or somewhat less.

Enjoy some cutting phornography.

Carbide phornography.

A gentleman in Germany sells small lathe electronic leadscrews for a living and offers stepmotors in the range of 1.5 to 3,3 NewtonMeter for leadscrew and crosslide.Your proposal is probably not to big.

Steppers for lathes

The real problem is to make sure that feed stops imidiately if lathe spindle stops unexpected.

Edited By Niels Abildgaard on 10/06/2020 15:32:37

Thank You.

Never seen it before

Will try

Diogeness reminded me of something I had forgotten.

In 2012 I fooled around with a square cutting material called Tantung(Stellite) and rounded the active edge to be, with abrassive paper with Corund/aluoxide.

Worked very well but it was important that the rounded edge was polished afterwards along the edge for better resistance to chipping.

Very precise rounding of edge

I am all Tungstencarbide now and wonder where I can buy abrassive band with Carborundum/SiliziumCarbide that can repeat that stunt .

Carborundum or silizium Carbide is much harder than aluminium oxide or corund that do not touch Tungsten Carbide .

Ebay also mention bands with Zirkonia as abrassive.

Is that hard enough to grind TungstenCarbide?

Edited By Niels Abildgaard on 10/06/2020 08:29:26

Edited By Niels Abildgaard on 10/06/2020 08:32:33