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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: Percival Marshall gramophone message?
07/04/2020 20:41:56

I used to play my uncles old wind up Garrard when I was a kid, the needles came in three grades, loud, medium and soft. You were supposed to use a new needle every time, The needles came in tins of 500.

Thread: Soft jaws
07/04/2020 20:33:07

Mick, I have done that once or twice when producing a female thread when there was no alternative to trying for size on the mating thread. The last one was a nut of about 2 3/4" diameter to hold the head onto the gearbox shaft of a Brantley helicopter. This was to lift the aircraft. I have a picture of the hollow shaft, rotated the wrong way round taken before making the nut. I took the nut out of the chuck about three times before getting a good match.

sam_0810.jpg

Edited By old mart on 07/04/2020 20:36:35

06/04/2020 21:31:52

I bought these recently, not that I needed them, but because they were cheap.

_igp2550.jpg

Thread: Coronavirus
06/04/2020 21:21:01

I was just doing the washing up at about 8pm and noticed a pretty pink vapour trail (con trail) going east towards Heathrow, probably. They would have landed about 8.20. Then I came to my senses and realised what a rare sight I had seen. When I lived in Godalming, Surrey, I could take the dog for a walk and see the lights of up to ten aircraft within my field of view simultaneously from the fields 1/4 mile from the house.

Thread: Homemade Lathe Tools
06/04/2020 19:04:36

Buying some 1/4" or 6mm square hss tool steel is easy on ebay, and grinding it only needs a humble bench grinder. Then you have the means to produce lots of stuff on your lathe. Perhaps somebody can suggest a list of good books to buy.

Thread: I once built a go cart
06/04/2020 18:55:34

I made a soapbox cart with 1 foot diameter pram wheels, it could carry at least 3 CWT and lasted for years. In my 20's, I was the mechanic for my friend who had a Barlotti Dino with a 9E Villiers engine. It managed about 20hp and always got into the A finals. Well mostly, the big end went bang on the Brands Hatch short circuit once, which meant only one race that day. These days, there only seems to be 125 karts racing. Go cart is a kids term for toys with motors, a world away from karts.

Edited By old mart on 06/04/2020 18:57:28

Thread: Soft jaws
06/04/2020 18:44:13

I have soft jaws for PB 5" chucks, a 125mm Chinese chuck and the 6 3/4" Pratt with the serrated jaws, which also has two sets of hard jaws. The 5" Pratt Burnerd chucks have lots of soft jaws, mostly bought cheap as job lots. They vary from 90% good to 90% used up. The worn out ones were milled to make them slot and tenon master jaws, and I have sets of aluminium top soft jaws to bolt onto them. Other worn out ones were milled to take short pieces of 1 1/2" AF hexagon brass stock which can be rotated one flat at a time using a central screw. They don't get used often, but are very useful when accuracy is needed. I used the serrated chuck to hold the X axis leadscrew of the Tom Senior mill when extending and evening out the threads, on conjunction with the tailstock, fixed and travelling steadies, all at once.

Thread: clarkson autolock 3mt
05/04/2020 17:02:48

I would keep looking on ebay, just search for Clarkson autolock every time you are on the site, sooner or later you could be lucky. MT3 to er32 or 40 would be easier to find, I recon.

Thread: How do I drill this hole
04/04/2020 21:41:22

Mill it is then, unfortunately. To get the piece mounted dead vertical is the first hurdle to cross. I would try to get hold of a block of aluminium, or two smaller blocks which could be milled for the ends of the casting to sit on. Maybe 2 blocks with holes for it to fit in. If the holes matched, the blocks could be attached to an angle plate and adjusted until the job was vertical.

Thread: How to make a silver steel axle
04/04/2020 19:04:56

You might look at sintered bronze for the bush. Giving the axel a polish with some 1200 paper would do no harm as long as it is well cleaned before re assembly.

Thread: How do I drill this hole
04/04/2020 18:59:20

Mick B1 has the best method to bore it accurately. A clean up skim on each end will allow it to be accurately aligned. The fixed steady, if you have one will hold the outboard end true, and enable recentring to give a good start for the drill. Start the hole with the shortest drill, or a solid carbide one and progress to longer drills. I would still drill from either end to a size slightly bigger than the axel which is going in, and drill a counterbore at each end for the axel bushes.

04/04/2020 14:18:37

You are going to have difficulty getting the alignment spot on using a mill, the lathe method makes it so much easier.

Thread: 2TB USB drives.
04/04/2020 14:10:32

I have bought several USB sticks on ebay without any problems. The simple rules that I keep to are a UK seller with a top feedback score. I go for the lesser known makes, such as Trancend which are less likely to be worthwhile counterfeiting than Sandisk.

Thread: Boxford Lathe résurrection
04/04/2020 14:01:59

There is no spindle lock on the Smart & Brown model A at the museum. Also, no accessible pulley, or belt to use Clive's method. We usually have to engage the back gear without unlocking the pulley, which locks the spindle. To avoid the sudden stresses which can strip teeth, we use a strap wrench to gently increase the torque. This works pretty well, especially as the chucks may be changed several times a week.

For a safer switching system, a no volt type with the large latching emergency off button is best.

**LINK**

Thread: Another mystery no. 100
03/04/2020 21:39:20

I think you're right, any idea what tune?

Thread: Square thread cutting
03/04/2020 21:28:50

Would you believe it, look what I saw on ebay:

**LINK**

03/04/2020 20:42:35

Here's a better picture of one of the grooving tools, this one is 1.5mm width and 16mm diameter. It gives an idea of the depth of groove obtainable. I would not buy this particular one as the price is outrageous.

 

**LINK**

Edited By old mart on 03/04/2020 20:45:07

Thread: Another mystery no. 100
03/04/2020 19:38:21

Its a prototype of a player for the 7" records.teeth 2

Thread: How do I drill this hole
03/04/2020 19:35:18

With a collet, or 4 jaw independent chuck in the lathe, you have the best chance of getting the hole straight. I would drill from both ends using a new split point drill, followed by a long series of the same diameter. Keep lubricated with AC90 or paraffin, and clear the swarf often.

Thread: 2TB USB drives.
03/04/2020 19:28:59

A friend of mine phoned today with a problem with his new USB stick. Windows 10 showed it as a 2TB drive, but it would not format. Since he paid only £6 for it, it was obviously not quite right. Kingston make real 2TB USB drives, they are much bigger physically than the run of the mill drives, and the price runs to four figures, not £6. I checked these out on ebay and there are plenty for sale. The sellers start by saying they are large, but deep in the description, a much smaller capacity is mentioned. Apparently, if you transfer large amounts of data onto one of these sticks, when the real capacity is reached, it just overwrites the data already onboard.

**LINK**

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