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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: 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.

Thread: Vise/Vice advise
23/08/2021 16:17:54

Those ARC ductile iron vises are very nice, but be careful to check the sizes before thinking of the larger one, it is quite big.

Thread: Left hand thread on a Chester drill spindle
23/08/2021 16:14:58

I'm not surprised, the spindles of drill mills and Tom Senior light verticals also have lefthand threads for their bearing adjusters.

Thread: Full size steam train goes off cliff for entertainment
21/08/2021 20:05:07

Remember the General and what happened to it?

Thread: Verdict indicator hair spring
20/08/2021 20:45:31

Replacing the hairspring would be quite difficult for a beginner. The exact hairspring would not be vital as it only eliminates backlash.

Thread: Casting blow holes
20/08/2021 20:37:41

They are very small compared to the casting size, Brian has the best answer.

20/08/2021 20:25:13

You might be able to fine tune the rack to loose some of that error. The other thing you could do is to take measurements at several points along the head travel and make a simple error chart which would account for the error. Exaggerating the 0.07mm on the chart would make it easy to read, and also work at intermediate positions. This would also work even if the rack was not exactly straight, 12 readings would be very accurate.

It would be interesting to hear from you how the modification was carried out.

Edited By old mart on 20/08/2021 20:27:30

Thread: QDM750/Kerry Super 8 spindle bearings
19/08/2021 19:30:29

It does look strange but being a drill, there should be none of the sideways forces associated with a milling machine spindle.

Thread: 60 degree thread insert
19/08/2021 18:51:09

A lot of people with smaller lathes do angle the topslide to lower the forces when cutting threads. I would advise that you do not until you have more experiance. If you cut fine pitch threads, say 1.75mm or less, then the added force will not be too big. Each thread should be cut in multiple passes, with the increase in cutting depth getting less at each subsequent pass until you are creeping up on the finished size. I personally never offset the topslide, even for 5tpi threads, but I have the luxury of a Smart & Brown model A which is heavier built than most.

Thread: Centec 2B - New arrival and Q&A
15/08/2021 21:01:08

It helps to have an idea which you tube contributers are genuine craftsmen and who are just being clever for the camera. I can recommend Joe Pieczynski, This old Tony and Abom79, they are amongst the genuine craftsmen that actually educate those of us willing to learn new and improved machining.

Thread: Milling machine
15/08/2021 20:40:50

It is handy to have 2 machines if you can manage it, and a lathe as well to complete the set. Be prepared to partly dismantle it if it is too big or heavy to get into position easily.

Edited By old mart on 15/08/2021 21:04:14

15/08/2021 20:32:48

I have found that even with a large size laser dot, that it is easy to estimate the centre. Of course, a tiny dot would be nice if possible.

Thread: Interfering with fits?
15/08/2021 20:26:40

I agree, make the joint with 0.001 clearance degrease both halves and use Loctite 601, 638, 620 or the equivalent. Leave the joint 24 hours and you are good to go. If you ever need to disassemble the joint, heat the assembly to 300C to destroy the Loctite. A turned finish, not polished will give the best strength of joint.

Edited By old mart on 15/08/2021 20:28:26

Thread: Milling machine
15/08/2021 16:59:01

Great, get some pictures posted when you have worked out how to do so.

Thread: Which is better Thompson or er collets
15/08/2021 16:57:35

If you are still unsure as to which system to favour, my vote would be for er, and I use both. If you have a lathe, then the same size er can be used on both machines if you get a collet plate which could also be used on a rotary table.

Thread: Hello from Winnipeg, Canada
15/08/2021 16:51:11

Welcome, Steven, when you get the lathe into the basement, remember to leave space for the mill that will follow shortly after you get used to turning and find that it isn't enough.

Thread: Milling machine
15/08/2021 16:47:15

Hi, Jonathon, try putting "albums" in the keyword box at the top of the page, or "photos", there will be some useful advise. For adding a link, you can go to the site and right click on the address and "cut". Then paste to the icon marked "link" above.

Edited By old mart on 15/08/2021 16:47:39

Thread: Silver solder flux has dried out.
15/08/2021 15:42:41

If you have a large lump of hard flux, grinding it down using a mortar and pestle will make it easier to make back into paste with water.

Thread: choices of material to turn
15/08/2021 15:39:34

You can look up the specifications for steel and aluminium on line and amongst the info should be the machining qualities. Aluminium should be cut with a little lubrication as if turned dry it can stick to the tool edge.

Thread: Dividing this would have been an interesting exercise !!
15/08/2021 15:35:40

As Pete Rimmer says, it is the parallel spacing that matters, the radial aspect could have been taken care of simply with a scratch made with dividers at two radii.

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