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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: Mini Lathe Upgrade
30/11/2020 05:33:19

It will also be no big deal to fit a 125mm big hole fourjaw on a 80mm mini spindle

125 chuck on 80 spindel

Edited By Niels Abildgaard on 30/11/2020 05:33:53

Thread: Diamond shaped inserts CCMT0602XX
30/11/2020 04:33:41

A maximum rigidity CCMT holder was described many years ago:

Shipshape

Thread: Mini Lathe Upgrade
29/11/2020 19:50:07

Parting need less overhang and stiffer spindle.The picture shows a mini lathe upgrade where spindle (ca 15 $ among chineesemanufactures ,bearings (less than 2$) and drive system (30$) has changed.The spindle belt drive disc cannot sit between bearing and has to come out in free air..

The gearing to leadscrew is unchanged and the 125mm four jaw is bored to 50mm.Front end of new spindle is 30mm bore.

Enjoy or improve

mini  modified.jpg

Thread: Lathe improvements?
28/11/2020 15:52:19

The screw forks are more fixed than the violence and screwdriver misuse that I like to apply.

I have cleaned up the boring and screws so that 48mm will pass and mass is 4.3kg.

wp_20201128_003[1].jpg

Thread: Electric motors for cars
28/11/2020 15:35:52

some state of art electric motors from Slovenia.

Link opens a PDF document

 

Emrax

Edited By Niels Abildgaard on 28/11/2020 15:36:49

Thread: Lathe improvements?
28/11/2020 05:55:49
Posted by Thor on 28/11/2020 04:50:13:

Hi Niels,

Thanks for the photos, well done. Will enlarging the hole interfere with the jaw adjusting screws? I see your chuck can be mounted on a backplate from the front, makes things easier.

Thor

The four jaw screws were cut in same operation as the chuck body.

Very healthy diet for a scrapped carbide cutter ,this mixture of cast iron and casehardened steel

wp_20201128_002[1].jpg

Thread: Restoring a Boxford AUD ll
28/11/2020 05:43:47
Posted by not done it yet on 28/11/2020 00:33:32:

Boxford? Screwed-on chuck? You are going to arrest the spindle from high speed, to rest, in a 1/4 second? I do hope you have nothing screwed to the spindle, or it may well unscrew in about the same time, or less. Wear your toe-tectors and don’t stand in line with the workpiece/chuck is my advice if you try that trick too often!

Seriously - don’t do it. It is dangerous.

Hear,hear

My chinese sewing machine motor on a 180 lathe unscrewed a 100mm chuck and I will never even think of screwed on lathe workholding tools.

Next time an impoverished and starved Boxford follows me home I will make it a new spindle and be my fifth .

box 329 10  flange.jpg

Thread: Lathe improvements?
27/11/2020 19:25:22

Hi Thor

It went better than expected to enlarge my 125mm four jaw.Trick was to keep screws fixed by blocking the jaws.

wp_20201127_001[1].jpg

wp_20201127_002[1].jpg

27/11/2020 16:04:41
Posted by Thor on 27/11/2020 10:18:14:

Hi Niels,

I have a lightweight (4.5kg) Indian 6 inch 4-jaw independent on my 290 lathe, the distance you asked is 31mm on the 6 inch and the chuck is about 45mm thick. As you say, the lighter chucks are easier to lift when you are old and have worn joints. I'm looking forward to see photos.

Thor

Hi Thor

Do You have a link to this range of chucks?

A 150 or 160 chuck on a 180 lathe is a little risky if the corresponding 125 can be bored to 50mm and be under 4 kg.

27/11/2020 08:39:36
Posted by Thor on 27/11/2020 04:48:28:

Hi Niels,

On my 80mm 4-jaw independent from ARC the distance is 29mm.

Thor

Thank You Thor

On my normal 125 it is 36mm and mass is 5+kg.

With Your 29mm a independent adjustable four jaw 125mm dia slimline with 50mm borehole should be feasible with ca 4kg mass.Nicer and safer than 9kg for a standard 160mm version that has a 50 mm bore from factory.

Edited By Niels Abildgaard on 27/11/2020 08:40:30

26/11/2020 19:41:32
Posted by old mart on 26/11/2020 19:28:23:

From the photos, particularly the first, it looks like there will be very little left of the inner part of the screws when they are cut to clear the 50mm bore. The remaining flanges are all that will hold the jaws and the screws in the chuck.

Instead of 9 flanges supporting the jaw I will have seven.

No big deal when in 35 to 50mm zone.

For smaller diameters I will use the 100mm four jaw enlarged from 25mm hole to 36mm.It is lower mass and more manegeable.

II am still thinking I will ask the manufacturer to make a ligthweigth 125mm/50mm bore  four jaw with screws and claws from the 80mm model.

Nicer for old toads.

If a reader has a 80mm four jaw can You please measure distance from front face to underside of screw hole like on picture?

wp_20201126_010[1].jpg

Edited By Niels Abildgaard on 26/11/2020 19:43:20

Edited By Niels Abildgaard on 26/11/2020 19:44:07

Edited By Niels Abildgaard on 26/11/2020 19:44:54

26/11/2020 17:55:15
Posted by old mart on 24/11/2020 15:19:53:

To match the oversized spindle bore, a chuck would have to be far too big for that little lathe, so the whole exercise is a futile wast of time and money.

Please find a picture of boring a 50mm hole in a 125mm four jaw chuck on a 180mm lathe with 30mm hole.

My 210 mm lathe is not running yet but has a 50mm hole in spinde.

Next picture shows how it will look on the 180 lathe ready for action.

I have not yet thought of an elegant way to cut the jaw screws.

They are hardened.

Any sensible objections?

wp_20201126_001[1].jpg

wp_20201126_003[1].jpg

25/11/2020 08:47:11
Posted by old mart on 24/11/2020 15:19:53:

To match the oversized spindle bore, a chuck would have to be far too big for that little lathe, so the whole exercise is a futile wast of time and money.

It was one reason for giving my Boxford away and starting on this expensive and futile journey,that chucks were getting uncomfortably heavy.

Mass shall not exed my latest 50£ 125mm four independent jaw. It is incredibly precise and well made.

When I plane the two faces of a 90mm disc there is maximal 0.02 mm thickness difference.Often less.

Hole is 30mm and can easily (I think) be opened to 45mm.

A 160 mm independent four jaw would come with a 50mm hole but would be to  heavy for old men.

A 160 mm independent four jaws that has moving parts from the manufacturers line of 80mm chucks will be optimum and can be lower mass.

The standard workholding equipement for a 50mm bore 180/210 lathe can be:

An ER40 collet holder that can be adjusted say 0.1mm relative to spindle flange and cover 2-29mm dia:

Standard 3Jaw 125mm Chuck.My old PratBurnered has 36mm hole.

Standard 4 jaw 125 opened to 45-46mm and a low mass 160mm four jaw with 50-55 mm hole.

All mounted with front screws.On my 180 it takes less than three minutes to change fro 3 to 4 jaws.

Edited By Niels Abildgaard on 25/11/2020 08:48:05

Edited By Niels Abildgaard on 25/11/2020 08:50:32

24/11/2020 16:09:28
Posted by Ian P on 24/11/2020 15:12:19:

That certainly looks a substantial spindle assembly. Presume you have access to a large lathe and other engineering facilities to braze and machine a spindle of that size. (machined after brazing?)

I agree about the vulnerability of screwed on chucks but having gone to the trouble you have, why not elect for camlock mount?

Ian P

The 125mm dia raw flange was machined on my 250 lathe that has been liberated by my son and the tube as well.

I worked at a copperbrazing site many years ago and the new owner did it at a fair prize..

If I knew where to get some Easyflow(No,No) I would have done it in garden.

The important step of turning thread and bearing seat in one go was done on my late 250.

The main zeal of exercise is to keep overhang from front bearing as short as possible and show the Chinese that they can do a better job within the given constraints.wp_20200426_002[1].jpg

24/11/2020 15:00:18

The MeGa 50mm hole spindle is in and waiting for a 1.5kW/3000rpm/12 Nm industrial sewing machine motor.

The Spindle flange and tube is copperbrazed..

Screwed on flanges or chuck are dangerous due to the instantaneous stopping of motor.

wp_20201124_001[1].jpg

20/11/2020 18:36:21

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.

 

wp_20201120_001[1].jpg

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.

wp_20201120_005[1].jpg

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

Thread: Machining Ball Screws Accurately
17/11/2020 19:28:57

Grease,free balls in balscrew and ER collets?

Thread: 180 Lathe tuning
09/11/2020 12:07:04

Made a M59.5/1 big nut for a 210 spindle with 50mm hole on a 180 lathe today.

It takes time but is pleasant.

I have bougth a new 210/38 hole lathe for less money than I gave for the first I had.

It cannot be of worse building quality so this is a clear win-win situation.

wp_20201109_001[1].jpg

The picture here is also shown by a german site

Nokia 1020 camera quality

but in much better resolution if You qulick twice on the picture

Thread: clarke cl500
05/11/2020 17:50:53

A cheap and to my view very good way to motorize lathes ,is to use an industrial sewing machime motor.

Thread: 180 Lathe tuning
05/11/2020 17:34:03

My much modified 180 with a homemade spindle needed a new and shorter chuck/faceplate/ER40 tool etc and I machined a M59.21/1mm thread close to headstock.

The sewing machine controller was set to 125 max spindle rpm and 25 to 125 rpm is controlle with left thumb.

it stops within 0.25mm axial movement.

 

wp_20201105_003[1].jpg

Edited By Niels Abildgaard on 05/11/2020 17:36:05

Edited By Niels Abildgaard on 05/11/2020 17:37:43

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