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Member postings for old mart

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

Thread: Help with machining Titanium
04/07/2021 15:10:17

Titanium is naturally silver colour, but can be anodised at different voltages to give lots of different colours.

Thread: Parting off problem
04/07/2021 14:38:13

If you still get problems after checking out all the suggestions, try facing off a bit of bar with an ordinary tool to make sure the cross slide is square to the spindle axis. Locking the saddle if you can when parting is recommended.

Thread: Help with machining Titanium
04/07/2021 14:32:28

As already mentioned, sharp tooling is the way to go. If you are intending to use carbide, then the polished inserts made for aluminium, often called H01 grade will work well. If you have to drill a bar, a sharp drill, slow speed, high pressure and plenty of lubricant, soluble oil being preferred. Titanium conducts heat slower than most metals, so you must not allow it to get hot if possible. After drilling a pilot hole, let it cool down before enlarging the hole. Tube would be the best option if you can get some of the right size. If you can get tube, make a plug to go in the part within the chuck jaws so you can get it nice and tight without distorting it.

Thread: Limp Probe
03/07/2021 17:53:33

At 600 rpm the pointer would oscillate ten times a second and be hard to read. The slower the better. I rarely use the one I bought, but would turn the spindle by hand first to be sure the eccentricity was not out of the pointer range. A point to remember is that the figures on the dial only represent an exact distance when the probe in use is the right length and angle.

The plastic locking ring on mine is split and comes off easily.

Edited By old mart on 03/07/2021 17:56:51

Thread: Sieg baby lathe not starting
03/07/2021 17:41:12

My 7 X 12 mini lathe has a fuse amongst the controls which used to trip when drilling. I changed from 1A to 1.5A and it is ok now, I hope I haven't overdone the rating.

Thread: What RCD NVR for a workshop?
03/07/2021 17:35:01

We had a volunteer at the museum who ran a 2Kw electric heater through a partially unwound extension reel and the inner 12 feet had to be removed as it had started to melt. He had been an aircraft electrician, so he should have known better.

I was concerned with the RCD's when setting up the 0.75 Kw VFD, but it has not tripped so far.

Edited By old mart on 03/07/2021 17:37:48

Thread: Milling machine in the (wood floored) workshop
03/07/2021 15:23:55

1" plywood is extremely strong, and spread across several joists would be plenty. Get a sheet of external type, marine ply is very expensive.

Thread: TNMG inserts
03/07/2021 12:48:30

We have three righthand and two lefthand holders for TNMG 16 inserts. One of each hand has an aluminium insert in it which is also good for fine finishing cuts on steel. I find that the cheap Chinese Drillpro brand for steel works very well. As Vic says, you get six edges as long as you don't knock the whole end off an insert. We have Sandvik, Seco, Kennametal, Iscar, Tungalloy and others bought cheaply on ebay. WNMG in 6 and 8 sizes are also good with six edges like TNMG. Try the cheap H01 grade if you are thinking of getting some for aluminium.

Edited By old mart on 03/07/2021 12:50:10

Thread: Boxford Model A
01/07/2021 19:07:39

Lathes UK may have something, they do reprints of manuals.

Thread: Machining Cylinder Head Chamber Roof - DIY or Shop Tool
01/07/2021 19:03:36

I did this years ago, not to tune the engine, but to lower the compression ratio when unleaded petrol came in. I did it by hand with a die grinder, fortunately the head was aluminium. Th match the volumes, with the valves and plugs in place. a piece of perspex with a hole in it covered each combustion chamber in turn, and a syringe was used with oil to get within 1/4CC each.

Thread: Strimmer /BrushCutter … any recommendations ?
01/07/2021 18:53:07

For a strimmer, be sure to get one that advances the line/s automatically when you tap the head on the ground. I ditched the posh one and went back to Black & Decker because of this .

Thread: Myford VMC Mill new nuts
01/07/2021 18:44:19

It's a good job you mentioned the insert, I have been transfering rubbish from the bin into a bin bag, searching, and found it after 1/4 hour. I now have 5, 6 and 8 tpi ACME inserts. I would like to make a better nut for the drill mill X leadscrew, but have not been able to find 2.5mm trapezoidal inserts.

Thread: Myford Super 7 with 'Big Bore Conversion'
30/06/2021 20:12:41

The whole spindle must be bigger diameter, as the common Myford spindle thread is 1 1/8" which is 31.75mm.

Thread: Acrylic as an Insulator
30/06/2021 18:53:32

If you have a digital meter, set it to 20 megohms and test that black plastic, it is very unlikely to be a conducting grade, but, being black, it could be antistatic, there is a remote possibility.

Edited By old mart on 30/06/2021 18:54:55

Thread: Is buying a custom ground tool my only option??
30/06/2021 18:33:43

Welcome to the forum, Guy, what you are up against is the great difficulty of turning a round groove which is one of the most difficult things to do without chatter. I have tools using round inserts of diameters from 6mm to 20 mm, but have never succeeded in getting the required finish in a turned groove. I would think that your best bet is finding a bearing that is near the size and getting the races ground as there will be some wall thickness available for modifications. I buy bearings from Simply Bearings, you might find they have something.

**LINK**

Thread: Myford VMC Mill new nuts
30/06/2021 18:17:55

The threading bar arrived back safe and sound along with a nice letter and some money, which was unexpected, but much appreciated. I will spend the money on tooling for the museum. Now I will have to get on with using the bar myself, very easy as the thread on the Tom Senior's knee is anticlockwise. Keep us updated with the mill repairs. smiley

Thread: Stuart SIRIUS on ebay
29/06/2021 15:33:51

It must be good, a steam engine from a smoke free home.wink 2

Thread: Your assistance requested
28/06/2021 20:47:39

As there is very little difference between 3mm pitch and 8tpi, you should measure the leadscrew not the nut, and over at least 30 pitches. 8TPI IS 0.125" and 3mm is 0.1181", only 0.0069" difference per pitch.

I just saw your 20=2.5", definately 8tpi.

Edited By old mart on 28/06/2021 20:51:31

Thread: Another dirty Brian trick - reversing the chuck
28/06/2021 20:37:01
Posted by Georgineer on 28/06/2021 18:03:58:
Posted by old mart on 27/06/2021 21:20:10:

Back nearer the topic, what do you want to reverse the spindle for? I have left hand boring bars and singlepoint threading bars which have justified a lock for the Smart & Brown model A, but the conversion was deemed much too sophisticated for anybody to copy when I posted a thread. 4 three jaw chucks, 1 four jaw and one er25 collet plate can be locked.

This sounds interesting Mart. Can I take the idle approach and ask you where the thread is to be found? (The alternative is to search for it, which might take me for ever.)

As for the matter of reversing the motor, I use an 'intermediate' light switch which cost a couple of pounds from an electrical wholesaler. It's rated at 10A and is never switched while the motor is running. Well, it was once by my carelessness, but the motor didn't even notice.

George B.

Back again, the thread was from 20-6-2019 in manual machine tools, "my version of a locking device for threaded spindles" There were no replies on this forum, but I had also posted on The home shop Machinist in the USA.

28/06/2021 19:53:16
Posted by Georgineer on 28/06/2021 18:03:58:
Posted by old mart on 27/06/2021 21:20:10:

Back nearer the topic, what do you want to reverse the spindle for? I have left hand boring bars and singlepoint threading bars which have justified a lock for the Smart & Brown model A, but the conversion was deemed much too sophisticated for anybody to copy when I posted a thread. 4 three jaw chucks, 1 four jaw and one er25 collet plate can be locked.

This sounds interesting Mart. Can I take the idle approach and ask you where the thread is to be found? (The alternative is to search for it, which might take me for ever.)

As for the matter of reversing the motor, I use an 'intermediate' light switch which cost a couple of pounds from an electrical wholesaler. It's rated at 10A and is never switched while the motor is running. Well, it was once by my carelessness, but the motor didn't even notice.

George B.

I cannot find the thread, but if you can access my album, the basic pictures are from the 3rd to the 8th.

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