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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: building a myford super 7 from bits ?
04/11/2019 19:27:32

 

Excellent plan, go for it.yes

The type of bed design should make them quite economical to have a regrind. Only top, back and front.

Edited By old mart on 04/11/2019 19:52:58

Thread: INT30 sensitive drilling attachment
03/11/2019 20:40:46

I have just found out that Gloucester tooling sell the iso30 boring head shank on its own. The thread is 1 1/2 X 18. They may be hard to drill and bore, but the thread would come in useful, as you might add more than one different length of extension to the shank for different quill travel requirements with bores matched. 

Edited By old mart on 03/11/2019 20:52:03

03/11/2019 20:05:28

Shame its a 40 size, I wonder how it is prevented from spinning round if you let go of the handle?

It would be too long even if it was a 30 fitting.

Thread: Boring bar toolpost.
03/11/2019 20:00:09

Didn't you read or understand my post? I said that inserts intended for aluminium are also very good for steel and CI (CAST IRON) using small depths of cut. Therefore putting less strain on the tool. Less strain means less flex on a tool which is having to bore a deep hole. Saving money by using the firms ancient tools is all well and good, but a compromise.

Thread: new computer
03/11/2019 19:14:43

Out of 14 SSD's that I have bought, from 32 to 500 Gb, only one has failed, a 120 Gb. I have had 4 hdds fail over the years. If I was going to buy a new pc, I would look at what Novatech have to offer in the UK. Or something like this if second hand:

**LINK**

Thread: Boring bar toolpost.
03/11/2019 18:31:23

I know what a B50 barrel is made of. I didn't like the tool because of that first generation style of insert in it. Times have moved on and there are much improved indexable tools on the market. How much metal do you intend to leave in the bore for the honing?

03/11/2019 17:47:27

If I was going to attempt that boring of the cylinder, I would not use that tool, unless there are inserts suitable for aluminium available for it. The aluminium grade inserts are sharp, and can be used with very small depth of cut, which would significantly reduce the forces on the bar. I would get one of these which use WNMG 08 inserts. I have some cheap Chinese inserts for aluminium which are surprisingly good when used on steel and CI with small cuts, right down to 0.0005".

**LINK**

02/11/2019 21:18:35

Were you aware that the recommended diameter to length ratio of a steel boring bar is 4:1, solid carbide is 6:1, the most expensive bars can go to 10:1, and they cost somewhere in four figures. That cylinder really needs a 3" diameter bar, and a much bigger lathe.

Thread: Bigger table for a small mill
02/11/2019 20:47:48

I do hope the op was taking the mickey when he said he was filing the tee slots. Or at least only filing the front side of them, otherwise he has wrecked a brand new table. Those slots are dead straight and exactly parallel to the X axis for a reason.

 Making tee slot nuts which fit the slots better than the bought ones is a good idea, they spread the loading better, Mike is making some out of key steel for the Tom Senior, they are also 20% longer than the bought ones.

I worked as a fitter in aircraft engineering but certainly not as a butcher as described.

Edited By old mart on 02/11/2019 20:52:47

Edited By old mart on 02/11/2019 20:56:44

Thread: INT30 sensitive drilling attachment
02/11/2019 17:38:06

The quill will need 1 1/2" overlap when in the extended position, and this is added to whatever travel it has. This is why I thought one of those sidelock holders might be suitable. Of course, the seller does not include the length of the bore of any of them, so its pot luck.

01/11/2019 21:14:15

Its a difficult project, what with the core diameter of the pull stud being only 9.85mm and some method to allow the chuck shaft to move axially and turn with the toolholder via a keyway or similar. The stroke will be severely limited, if the whole assembly is not fairly long.

These sidelock spindles may have the answer to the finish of the bore and the screws could drive a slotted spindle.

**LINK**

01/11/2019 19:47:13

Just a thought, but these boring heads are screwed onto the arbor, and if you have a lathe, you would have more options to design the keyed sliding part, and also have a boring head at the same time.https://www.ebay.co.uk/itm/SOBA-50-mm-Boring-Head-Complete-with-Tools-INT-30-Shank-Metric-17113030-ISO30/372164615910?epid=3011275466&hash=item56a6bd5ee6:g:kRIAAOSwDFBaL9SP

An er32 collet holder also has a thread which has potential.

Edited By old mart on 01/11/2019 19:47:58

Edited By old mart on 01/11/2019 19:50:51

Thread: New lathe next week
01/11/2019 19:22:53

DRO,s are nice on a lathe, but not vital, I would spend the money on tooling. On a mill, not having a DRO is a great disadvantage.

Thread: ER32 Extender
01/11/2019 15:03:29

I looked on ebay, and there were er32 holders up to 140mm long in diameters up to 32mm, also MT 2, 3 and 4. The straight shank would fit in a four jaw independent for fine tuning the runout, and be adjustable axially.

Thread: Lathe chuck guards - how many folk use them?
31/10/2019 21:07:33

About 3 years ago the museum had a visit from two young ladies from health and safety, who looked at the machinery and really didn't know much about any of it. They were probably more at home in shops and restaurants. I thought that something ought to be done about the lathe, which had next to nothing in the form of safety devices. I bought a cheap stop button which got glued over the ancient one, at least it is much bigger. I was talking about making a chuck guard, when Chris said that he had seen one up on the mezzanine amongst the bits and pieces of helicopter. It was exactly the right size and is now on the lathe with an industrial microswitch which I had saved from being dumped as surplus from my old firm. Having the microswitch saves me from bending down to stop the lathe, which is welcome. They never came back, all the radioactive things that this sort of museum has must have put them off.

Thread: Thread gauge
29/10/2019 19:32:55

I use full profile threading inserts, they are the proper shape for the job.

Thread: Aircraft General Discussion
27/10/2019 20:01:17

I remember riding a motorcycle along the Hogs back between Farnham and Guildford (A31) and seeing a Hercules very slightly below me to the north.

Thread: I just added 50 mm of daylight...
27/10/2019 19:12:40

Dead right Michael, the problem is that the threads in the tooling are not always exactly in line with the axis of the spindle. The drawbar of the drill mill is more forgiving due to slight wear. There are a lot of tools to test out on the TS, just running the tap down has cured most that I have tried. Having a self extracting drawbar will make the tight ones more difficult as they cannot be slammed home in the taper before engaging the drawbar. However niggling these problems are, I will not put pins in the spindle, or change to a loose drawbar. now I have experienced the advantages of the present setup.

 I wonder if the ISO30 spindle could have similar problems with the drawbar thread being tight?

Edited By old mart on 27/10/2019 19:15:43

Edited By old mart on 27/10/2019 19:16:28

Thread: Hello from the Netherlands
27/10/2019 14:27:59

Welcome, Jurrian, your lathe looks good, maybe a toolmakers lathe, it is very heavily built for its size.

Thread: Jacobs model 6414 chuck - removal
27/10/2019 14:22:48

I had a B & D D720 drill back in the late sixties and when I took the cover off the side of the handgrip to look at the switch, I was horrified to see that the insulation had gone hard and was cracking off. This was in the early eighties, the drill got binned immediately, especially as it was metal and predated double insulation. I suggest you check all of these old drills for safety, especially the earth wire connection.

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