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Member postings for Niels Abildgaard

Here is a list of all the postings Niels Abildgaard has made in our forums. Click on a thread name to jump to the thread.

Thread: Leadscrew suppliers
08/07/2020 11:40:23

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

Tr 16 * 3 and nuts

Thread: Boxford Lathe Big Bore Conversion
04/07/2020 15:30:17

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

simple 32916.jpg

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

Thread: My new lathe a Warco 918
28/06/2020 18:08:03

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

Thread: Under Radar Lathe upgrade
26/06/2020 19:48:39

Design for improving lathes with 62mm bearing holes.

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

total stikleje.jpg

Thread: My new lathe a Warco 918
23/06/2020 10:20:32

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.

Thread: Buying first lathe
22/06/2020 13:52:29

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

Thread: Tangential Tool Holder
22/06/2020 04:38:12
Posted by DiogenesII on 21/06/2020 21:21:22:

I'm happy with the results. I have a good tool that will reduce the need to change & set (my shamefully haphazard collection of brazed carbide & HSS) tools so often, that doesn't need shimming, and in which the hard toolbit is rigidly held just off the front corner of the soon-to-be-bare topslide.

..I have no doubt a little tweaking and refinement here & there will follow, and I'll try some tougher and some softer, material soon and see what it does with that.. more anon..

Thanks for all your help, Niels.

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.

20/06/2020 10:04:50

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

Thread: Boxford motor help
20/06/2020 09:55:30

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

Thread: A very nice 2.5cc control line speed engine
13/06/2020 10:21:35
Posted by Steviegtr on 12/06/2020 22:56:30:

Are you sure of the power output. 1 bhp per cc.

Steve.

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

Thread: Lathe improvements?
11/06/2020 15:10:14
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

Thread: Tangential Tool Holder
10/06/2020 20:44:41
Posted by Jouke van der Veen on 10/06/2020 20:05:53:
Round tangential tool limits

Niels,

I have to read this thread all through. It contains a lot of information.

Probably, you are right that the angle I had chosen (26 degrees) was to large. Making it smaller (more vertical) gives an ellips closer to a circle and the tip angle constant for a larger angle along the circumference of the tip.

Niels,

When I look at your pictures It looks to me that you make, as an example, a depth of cut of 1.5mm, measuring in the axial direction of the lathe And you feed in the radial direction by movement of the cross slide. So, I would mention it a radial feed and not an axial feed. But I may be completely wrong. Please, could you clarify this?

Jouke

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.

Thread: My new lathe a Warco 918
10/06/2020 15:28:29
Posted by Ron Laden on 10/06/2020 13:10:13:

 

I have sketched up how I would tackle it and have been looking at what I think would be suitable geared motors, currently considering the Mclennan range (picture below) 24 volt, 30/1, 110 rpm (24v), 15N/cm, decent quality with all metal gearbox and reasonably priced. The motor is a bit of guess work as I dont know what sort of torque is required so the one I am considering is down to my thinking it would be ok.

 

 

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

Thread: Tangential Tool Holder
10/06/2020 09:07:41
Posted by AdrianR on 10/06/2020 08:43:50:

What about diamond paper? **LINK**

Adrian

Thank You.

Never seen it before

Will try

10/06/2020 08:24:20

I hadn't thought of, er, the high-level advanced technique of using a strip of abrasive paperblush..

 

 

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

09/06/2020 15:03:08
Posted by Jouke van der Veen on 09/06/2020 11:13:11:

This was the “trial” tangential cutter I used. A toolbit of silver steel in a brass tool holder. Angle of toolbit and diameter were chosen to get the desired cutting radius. I used it in an Emco Compact 5.

Edited By Jouke van der Veen on 09/06/2020 11:14:03

Jouke

Interesting,but why so much tilt on toolbit if You can make it to any diameter,as I asume You can from the photo?

Your Emco spindle has what I ,after much consideration and not much expirience, consider the best way.

Three or four screws through chuks to front of spindle.

Very short ,strong,safe and fast to change.Whats not to like?

09/06/2020 13:47:13
Posted by Leo F Byrne 1 on 09/06/2020 13:29:28:

I have a tangential tool holder from Eccentric. Wouldn’t be without it.

What lathe do You have?

It could be fun if someone will try and compare with my homemade.

09/06/2020 11:59:45

Niels,

Could you explain why the depth of the cut can not be deeper than appr. the radius of the toolbit? I expect that you mean that cutting a depth of, lets say 2mm, will be done in more steps.

There is an old thread that have pictures etc.

I tried 6mm carbide and allwent well untill 2.5mm depth of cut.Then lathe was not really up for more.It was therefore reasonable that a 3mm tool should be able to do 2.5mm wide also from a lathe power viewpoint.

That might have been the case put cutting was not possible.Noise was unpleasant,swarf curled wrong and it had to stop.

Doing 1.5mm and down it was pure music

Round tangential tool limits

09/06/2020 06:49:35
Posted by DiogenesII on 08/06/2020 22:56:08:

How and what do you sharpen your toolbits on, Niels?..

Edited By DiogenesII on 08/06/2020 22:58:57

There is a picture of sharpening here and stone is a carborundum or silizium carbide and not expensive,but diamond in some form is better.

Tangentials

08/06/2020 18:45:22
Posted by DiogenesII on 08/06/2020 08:30:30:

..parting a slot - now that is scary! ..I'll stick with a slitting saw..

 

You aint seen nothing yet

wp_20200608_007[1].jpg

It has tasted a 12.9 screw and chatters at lower work rate than my 2times 2 square versions.

The distance from front bearing to work area is far to long.

Bigger spindle and shorter overhang before making final verdict.

wp_20200608_010[1].jpg

Edited By Niels Abildgaard on 08/06/2020 18:47:19

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