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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: Changing internet providers
11/10/2019 16:02:17

I have had a Sky account for over fifteen years, which includes tv, phone and internet. I seem to pay well over the odds and the internet speed is slow considering that I live in the second biggest town in Somerset.

Things are changing, as today, Virgin have just finished laying fibre optic cable in our street. It will be ready to go in the next few weeks and I will be changing to Virgin for tv, phone and internet, which may well be up to 6 times as fast as my present speed for less than half the outlay for the first year and then 3/4 what I am paying now.

I have lots of internet accounts including this forum, and would like to know the best way of changing over. I thought of changing the accounts to a Gmail address from the SKY one before getting the new Virgin address to make sure things don't go horribly wrong at the last minute. What do you think I should do?

Thread: Is this chuck mounted on a 5C collet?
11/10/2019 15:42:47

It is a very good price, but not of use to me as the S & B model A uses smaller collets than the 1024. Anyone just needing the arbor would do well to buy it and then sell the chuck for over half the initial outlay.

Thread: Telescopic bore gauges
10/10/2019 22:22:01

I have a set of the cheap ones and three old Moore & Wright ones. The M & W get used if they cover the size, and 0.001" is easy to get and repeat. The cheap ones are rough feeling, I should take them apart and smooth them and add a little oil, that might improve their feel.

Anyone who has just bought their first set should practice with some decent holes in materials, to get the feel and repeatability which is possible.

Edited By old mart on 10/10/2019 22:27:20

Thread: Tom Senior vertical guards
10/10/2019 22:12:30

These pictures and links will be very useful when we get to designing guards, we can't afford to buy them, and will have to utilise the materials to hand, thanks, guys.

Thread: Is this chuck mounted on a 5C collet?
10/10/2019 22:07:45

I noticed this collet mounted chuck on ebay and wondered if the mount is 5C. The chuck is Chinese, obviously, and I recognised the make. It is made by Huhhot Machine Tool, the same make as one of the chucks which we have at the museum. Our one is a 125mm, and the quality is well above the average Chinese one.


Thread: Tom Senior vertical guards
10/10/2019 19:51:04

I've had a look at the Technology Supplies milling machine guards, and particularly the fitting at the ends of the bed, which may be the way to go. Tee slot mounting could be made very adjustable to suit different jobs.

10/10/2019 18:45:37

_igp2442.jpgFood for thought, they are all good, and if the health and safety people visit and see that we are making an effort, they can be remarkably helpful. The 6mm polycarbonate is pretty much bomb proof and it can be bent when a hot air gun is used. Some of my efforts at heating it have ended badly with a local overheating which makes it start to bubble up. The TS does not lend itself easily to a permanent guard, a small one might fix to the quill where a substantial aluminium ring is clamped on to connect to the Z axis digital readout.


Thread: Warco WM18 milling head shake ( technically spindle is precessing) when plunge milling a blind slot.
09/10/2019 22:34:59

I remember plunging a 1/4" slot drill about 1/4" deep and getting a hole 0.015" oversize. Changing the cutter resulted in a hole only 0.001" oversize, yet there didn't seem to be much difference in the sharpness.

The trouble with plunging two flute slot drills is that viewed end on they are asymmetric, so they drill like a badly sharpened twist drill. For cutting the actual slot, two and three fluted mills are much preferable to four fluted as the 90 degree separation of the cutting in the four flute interferes with the cutting.

Recently, I wanted to cut a quick flattish bottomed hole in a piece of 23mm square aluminium. The hole was 3/4" diameter, and 1/2" deep. The aluminium went in the lathe four jaw and a new Osborn slot drill went in the tailstock chuck. The tailstock was shaking at least 1/16" when I made the hole.

Edited By old mart on 09/10/2019 22:43:26

Thread: Tom Senior vertical guards
09/10/2019 22:18:00

The T S light vertical we are working on at the museum is nearly finished, but there is one point I have so far failed to address, namely the fitting of some type of guard. This machine will be used by some of the volunteers at the museum, and must at least pay lip service to health and safety. I have never seen pictures of one of these mills with any type of guards. I have a supply of 6mm polycarbonate which has been used to make guards for the mill drill, and I would be pleased to hear from anyone who has any type on their machine.

Thread: Metrication of models
08/10/2019 19:10:40

I wouldn't be without my Shetack Monument thread reckoner. It has metric coarse, BA, UNF, UNC, BSF and Whitworth threads side by side. This makes it easy to compare sizes quickly.


Thread: Warco WM18 milling head shake ( technically spindle is precessing) when plunge milling a blind slot.
08/10/2019 18:52:00

Jason B's suggestion is best, leave less material for the slot drill to plunge into. A solid carbide four flute end cutting mill will plunge much better than a two flute slot drill, which is preferred for the actual slotting.

Thread: End mill for EN16
07/10/2019 22:53:24

Good, you have the up to date inserts. You might try some of the cheap Chinese ones from ebay, they have improved a lot in recent years. For roughing steel surfaces, you cold get try and get tooling which uses round inserts, you can turn them a little at a time, and get up to 8 goes per set. I recently got a 40mm shell mill which uses 4 of the small APKT inserts, it had a 22mm arbor fitting.

Thread: Metrication of models
07/10/2019 21:44:40

15 years ago, a workmate was building a custom car, road legal, based on a Ford Pop which had a tuned small block Chevy engine with nitrous injection (9.75 quarter mile, that thing went well) and several of the special goodies bought from the USA had metric threads and fasteners.

Edited By old mart on 07/10/2019 21:45:26

Thread: Battery charger problem
07/10/2019 21:29:32

You will find that the triangular 12V Parkside batteries have changed in the last year. at first glance they look the same, 12V, 2ah, but the new ones do not fit the older tools. The newer type are available at most Lidl shops and a range of tools including an SDS drill, angle grinder and drill driver are on sale especially in the larger shops.

Edited By old mart on 07/10/2019 21:33:30

Thread: Triangular Screws
07/10/2019 21:19:44

They are a cost effective method of screwing directly into holes which are in castings of zinc or aluminium alloys and which have a draft angle, not being drilled. Generally, they are not intended to ever be unscrewed.

Thread: End mill for EN16
07/10/2019 21:05:09

I would get indexable tools for your mill, this one is 12 mm for APMT11 inserts (1). The inserts are double ended and would be a lot cheaper to run than buying solid carbide end mills. The shank can be cut shorter if required with a hacksaw.

I have just seen that you are already using indexable inserts. I would be inclined to run at 4000rpm at least with these. The ones that you are using are first generation if they are TPUN and not exactly suitable for a cnc mill.


Edited By old mart on 07/10/2019 21:08:37

Edited By old mart on 07/10/2019 21:12:41

Thread: Newbie with a chuck query
07/10/2019 20:42:51

I would carefully measure the jaws and make a drawing including the teeth pitch, and keep checking the ads on ebay, sets do come up from time to time. Rotagrip sell soft jaws for your chuck, which could give it a new lease of life for special jobs, where perfect running is important.

Thread: Grinding wheel 'washers'
07/10/2019 20:37:00

The cardboard from a cereal packet or slightly thicker would be fine, you could cut a stock and change them every time a wheel is changed. As you are obviously aware of the importance of the soft interface, there is nothing more to say.

Thread: Hello From Horsham
06/10/2019 19:49:27

Welcome John, there are a lot of old motorcycle enthusiasts on this forum.

I used to live in Rusper and Lower Beeding about 60 years ago, I last went to Horsham about 12 years ago.

Thread: Would you buy one of these collets?
05/10/2019 23:18:19

You would need a very strong Jubilee clip on the end! laugh

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