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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: Is there any benefit to copper plating before nickel plating?
30/08/2021 18:17:22

Unless you intend to keep the machine outside, I don't think there will be much difference between the two approaches.

29/08/2021 18:26:15

The original reason for the copper was that the nickel would not adhere well to steel directly, it was the thick layer of dull nickel that was mechanically polished prior to chrome plating.

Thread: Myford threaded chucks on a Rotary Table?
29/08/2021 18:15:36

I have seen adaptors which bolt down to the RT and have the Myford thread on them, three bolt and four bolt on ebay. Climb milling with small cuts is not likely to unscrew the chuck.

Edited By old mart on 29/08/2021 18:20:11

Thread: Is there any benefit to copper plating before nickel plating?
29/08/2021 16:18:00

It always used to be the case, but you may not need it with a modern nickel solution. There should be recomendations included with the nickel bath specification.

Thread: Metal Planer by George Plant & Son
29/08/2021 16:11:50

Its a shame about the broken tee slots, I wonder if there is any way of turning the table round?

There is a bigger one at the Underfall Yard at Bristol.

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Edited By old mart on 29/08/2021 16:14:29

Thread: Ok to grease Myford feedscrews?
29/08/2021 14:13:14

When the apron was being refurbished on the Smart & Brown model A, a new leadscrew nut was made. I decided to fit the telescopic springs either side of the saddle and they keep the leadscrew pristine. I use oil to compliment the automatic oiling system by just pulling back the springs and squirting some extra oil on the leadscrew. Myfords, such as the one illustrated in this thread would work very well with springs added as their presence would not restrict the travel of the saddle.

Thread: Build a Pallet Beehive
28/08/2021 21:45:12

Building a pallet beehive is very hopeful, I would think the odds against a swarm of bees finding it are about a million to one.

Thread: Hanson Steel Buildings
27/08/2021 18:35:34

When the garage roof where I used to live became impossible to seal due to a very shallow pitch and two joints in the corrigated asbestos, I looked into various ways of replacing it. It was about 18 x 25 feet. The cheapest was the industrial sheeting which buildings are commonly made of today. I had condensation problems and lined the sections with sheets of expanded polystyrene, but had to leave the two strips of fibreglass single thickness to let the light through. The modern take on this building sheeting has solved the condensation problem and thermal insulation by using two sheets of the steel with a thick layer of polyurethane foam between them. The stuff is so common nowdays that getting some should be easy wherever you live.

Thread: Identifying Monel metal rivets
27/08/2021 18:18:44

I would not think that monel rivets would be used in conjunction with aluminium in a Harrier airframe. The monel is rather hard compared to aluminium and there are dangers of corrosion. There are riveted steel parts in the hot areas which would be more suitable applications. Try beating one of the monel rivets on a smooth steel plate, or squeeze it if you have a powerful enough press and see how ductile it is.

Thread: Something to spend your pocket money on
27/08/2021 16:57:33

WOW! what a fantastic sale. I had a look at everything, and noticed the large number of models made by the late Duncan Laidlaw. Also for sale were the lathe and mill they were made on. It is proof that you do not need hugely expensive equipment to make wonderful things, just skill.

Thread: EN1A verses black mild steel.
27/08/2021 16:40:13

The Helicopter Museum is at Weston-Super-Mare, in the UK. I got bored and just ordered a metre of the 22mm EN1A from the cheapest ebay seller today, just over £24 post paid.

The threading will have to be done before the tapering, there will be no parallel surface to hold onto after the taper is produced. The easy way for me will be to turn a couple of inches of 1" bar true and put a 1/2 UNF female thread in it. Then each blank with the threads either end and one centre for tailstock support can be screwed into the chucked up holder for taper turning. The Smart & Brown model A has the taper turning attachment, which makes it easy, as the length of taper required is twice the compounds movement.

Edited By old mart on 27/08/2021 16:41:47

27/08/2021 13:05:11

The blade bolts are for a Piasecki H21 flying banana twin rotor with six blades. We only have about 3 blade remnants, so 6 bolts will be plenty. The bolts are slightly larger than a Wessex bolt and from the limited pictures are similar desigh with a thread either end. On the Wessex the tapered bolts are pulled tight by a nut with a large flange, which also fits the other end. When removing or loosening a bolt, the nut is fitted to the large end to break the taper. We don't have any Piasecki nuts, but Wessex ones are the right size and have 1/2" UNF threads and most importantly readily available which will save me making them from 38mm bar.

Original bolts would have been made from heat treated chrome moly, but mild steel is plenty for a museum exhibit.

Edited By old mart on 27/08/2021 13:08:05

26/08/2021 21:02:32

The 22mm diameter is perfect as the largest diameter will be in the region of 20, and also because the spindle bore of the Smart & Brown model A is 63/64", about 25mm.

I was thinking that the black might be EN3, and that would make the saving in price not worth while.


Thread: Mill vise and rotary table
26/08/2021 20:48:08

If your vise is no bigger than 4", 100mm, then it is not so heavy to move and it can be removed in seconds. A 6" rotary table with a chuck on it is getting close to my limits, but does get in the way if left on the mill, and I am one of the lucky people to be able to choose which of the two mills sitting side by side at the museum to use for a particular job. Today I wanted to square off a 3 inch wide workpiece using the Y axis, and the Tom Senior was not up to it even trying different table slot positions for the 100mm Bison vise. I just moved to the drill mill and the job was easy. With hindsight, I could have removed the key from the vise and mounted it lengthways on the TS bed.

Edited By old mart on 26/08/2021 20:52:22

Thread: EN1A verses black mild steel.
26/08/2021 20:27:26

I am looking at making some replica helicopter blade bolts which will be tapered and threaded each end. I require 1 metre of 22mm diameter steel. My first choice is ENIA for its general machinability. While looking, I noticed that black mild steel is cheaper, but the sellers do not mention the grade. I suspect that the black stuff might not be so nice to machine, any thoughts on the subject would be welcome.

Thread: small white spots
25/08/2021 20:51:16

You can try running a colour screen test program to see if there is any problem with your pixels.

Thread: Aging fingers
25/08/2021 20:48:28

One thing that relieves osteo arthritis temporarily is hot water. My fingers are better after doing the washing up.

24/08/2021 15:01:31

I was diagnosed with arthritis 35 years ago and my fingers were first to be affected. Now I cannot touch any of my finger tips with the thumb on the same hand, or make a fist. The doctor gave me a good bit of advice, "keep your hands straight or they will end up like claws". I have taken glucosomine sulphate and omega 3 for many years, they might have slowed the onset, I will never know for sure.

In the workshop I keep telescopic magnets which do help with bending down and aid picking up ferrous objects dropped. I have one of those long grabbers at home, and even find the spring loaded trigger difficult and painful.

Thread: Getting accuracy with my newly added DRO.
23/08/2021 20:48:17

I wonder if the op's cutters have been sharpened and any size on the shank might then be suspect. Certainly, the solid carbide cutters that I use the most come much closer to their stated size. If the cutter is running out of true, it would tend to cut oversize.

Thread: Left hand thread on a Chester drill spindle
23/08/2021 18:00:40

The drill mill has a four speed pulley with a taper fitting and also a lefthand thread nut, but the nut is a substantial cast iron one of about 58mm spanner fitting with almost 25mm of thread length. The taper should never break in use to enable the pulley to unscrew the nut. When I dismantled the mill, I removed the pulley with great difficulty by putting a puller on it and then applying heat from a hot air gun.

You should address the poor fitting taper on the drill. The easy option would be a little Loctite on the taper, but keep it off the nut threads.

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