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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: Mystery lathe backplate
11/06/2019 16:59:06

The mount on the Siege SC6 looks a bit like a contender. and Chuck Mounting

Thread: Annealing Mild Steel
11/06/2019 11:59:13

We used to stress relieve steel at 190C for 4 hours and let cool naturally. Mild steel might benefit from this treatment which can be carried out in a domestic oven. As my old firm made aircraft parts, the steel we used was never mild.

Edited By old mart on 11/06/2019 11:59:41

Thread: Start of Tom Senior refurbishment.
10/06/2019 21:34:00

The rubbing of the bed is proving slower than wished for, but the smooth areas are gradually getting bigger.

I have made two 3/4" X 5 ACME nuts out of 100mm of leaded gunmetal. Making them antibacklash will mean sacrificing some of the length as the design of the mill X axis means that the travel will be shorter as the nut length increases. The only way around this is to cut a little more thread on the leadscrew. I am thinking about this, two inches of extra thread would allow the nuts to be full length.

As made, the nuts have about 0.005" backlash unlubricated.

Thread: Ebay 'photos'
10/06/2019 18:17:50

I have been selling some things on ebay recently and use an slr with a macro lens and a ring flash. Multi megapixel resolution is not required, I set the camera to 2 megapixels having found that the photos take forever to transfer to ebay if the full resolution is used. I also check each photo for the right focus and exposure before using them.

Thread: Annealing Mild Steel
10/06/2019 18:09:47

You could smooth the edges of the bend with a bit of 400 wet and dry paper before bending it so there is no sharp edge. This reduces the tendency to crack. Really sharp bends should be avoided if possible. Soft stainless steel is more ductile than mild steel.

Thread: A Very Nice Freebie
10/06/2019 16:42:33

On the other forum that I am a member of (The Home Shop Machinist) that would rate a "you suck" and rightly so.

I have a set at the museum that required a little tlc before using, I had to scrape the rust off of 90% of them. Still they are better than nothing and I am glad to have a set.

Thread: Internal grooving help required.
10/06/2019 13:53:31

The grooving insert holder in Pauls post is for MGMN inserts which are commonly available widths of

1.5, 2, 2.5, 3, 4 and 5mm. Each width has a dedicated holder, and the inserts also fit in left and right handed parting off tools. I believe the grooving tool shanks only go down to 16mm, limiting the minimum hole size and are too big for smaller lathes. The tips are commonly Chinese, but Korloy also make them. The inserts are double ended.

Edited By old mart on 10/06/2019 13:54:34

Thread: Strange clamps
10/06/2019 12:54:59

Used all the time by toolmakers and jig makers, the drilling bushes are hard and quick detachable by gripping and twisting the knurled top. The jig would also be used on drilling machines for production runs.

Thread: Mystery lathe backplate
10/06/2019 12:38:09

_igp2346.jpgI will try and post a couple of pictures. The chuck is unused but pretty old, made in England, definitely predating the metric 100mm versions. Having stripped, cleaned, lubricated and re assembled it is a beauty, both sets of jaws are tight and body and jaws serial numbers match. I couldn't resist the price, £45.50 including postage.

Edited By old mart on 10/06/2019 12:47:00

Thread: Cardibe inserts
09/06/2019 19:04:03

I have bought lots of the cheap Chinese toolholders for carbide inserts on ebay, they are almost as good as the big named brands. 

 The second letter "c" indicates a positive tip angle of 7 degrees, and the insert is held level in the toolholder and the "n" means neutral with no relief (square end) with the insert dipping down 7 degrees in the toolholder to provide cutting relief. When you get the other holder the difference will be obvious.

Edited By old mart on 09/06/2019 19:11:11

Thread: Mystery lathe backplate
09/06/2019 18:24:29

I have just bought a new 4" Burnerd chuck with both sets of jaws, model N30. Definitely imperial as the fixing screws are 1/4" Whitworth.

It came with a backplate which I have failed to identify, even by googling.

The backplate is held on the spindle by three 5/16" BSF studs at approximately 49mm pcd. From slight witness marks the flange of the spindle is 62mm diameter. A tapered projection of the spindle around 36mm with an included angle of about 11 degrees centralises the backplate.

Someone must know.

Thread: Smart & Brown model A drawings
07/06/2019 16:04:05

Sorry, the message was from The artful codger, as I am new to the forum, I have difficulty navigating it and mislaid the message.

Thread: Cardibe inserts
07/06/2019 15:59:26

You might be lucky enlarging the hole with a diamond file out of one of those cheap sets of needle files.

As already mentioned, are you sure the inserts are the same as what you have already got? VCMT have only 2 edges at a 7 degree angle and VNMG have square ends and 4 edges.

Thread: Need to drill a hole digital caliper
07/06/2019 15:51:57

The best way short of investing in solid carbide drills is to get a set of Bosch multiconstruction drills from Screwfix (95958). I keep a set for drilling hard steel, rather than masonry, their sharp tips are not brittle like solids and they are much cheaper.

Thread: Smart & Brown model A drawings
07/06/2019 13:18:53

I have had a request from a member regarding lubricating the spindle bearings of the model A.

 The front bearing lubrication point is just to the rear left of the right hand end of the spindle. 

The rear bearing lubrication point is just to the right of the plunger lubricator at the left end of the headstock.

 Joining the Yahoo group for Smart & Brown gives access to a mass of instructions and drawings you can download and print out for free, as well as advice from members.

Edited By old mart on 07/06/2019 13:27:34

Thread: Difference in spindle sizes
07/06/2019 13:08:30

Can anyone tell me if there is a difference between Boxford 1 1/2" X 8 and Atlas 1 1/2" X 8 spindle dimensions? I wonder if there is compatibility between registers and thread types?

Thread: Super 7 - Best way to use ER25 Collets
05/06/2019 22:57:23

Alex, if you get a MT2 holder, it will require a 10mm drawbar. The cheapest way to make one is by getting a length of 10mm studding and a couple of nuts. You will still have to turn up and drill something to fit in the left hand end of the lathe spindle to seat the drawbar.

05/06/2019 19:14:11

An ER32 collet will not fit an ER25 collet chuck and vise versa.

Thread: Insert brring bar negative rake
04/06/2019 18:35:49

You might run the tip a couple of thou high to compensate for the bar deflecting downwards. When taper turning or boring, the tip must be dead on centre or the taper will not be the correct angle, or straight.

Thread: Quicksilver
04/06/2019 18:29:05

Organic compounds of mercury are extremely toxic, methyl mercury that was the cause of the Minimata disaster.

I was told by a doctor that the danger from the old style clinical thermometers was from the broken glass if the patient bit it. The mercury would pass harmlessly through the body before it had time to break down into something easily assimilated.

I had a few panicky minutes when I blew a mercury manometer over an aircraft oxygen regulator that I was testing. Fortunately for me, it was the anodising that protected the aluminium regulator.

We kept mercury in cast iron pots or polypropylene containers.

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