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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.

08/08/2021 20:48:25

I have never checked the surface of the window to see whether it is truly vertical, but have thought about a mirror to get a stronger reflection. I did try the laser on the front of the mill head pointing sideways at the other end of the building about 70 feet away, but it didn't seem to be an improvement. Those lasers come from ebay and include a number of mounting options as well as the remote squeeze switch for use with a rifle.

Terry, you have got your "upper and lower" quill bearing races the wrong way round.

Edited By old mart on 08/08/2021 20:59:54

Thread: The shed may not be dead!
08/08/2021 19:32:07
Posted by Neil Wyatt on 06/08/2021 10:57:03:

Fear not, indeed!

Ironically, lockdown has been a big incentive for people to get on with all sorts of hobbies - and if you've missed out on a holiday, why not spend some of it on something else that gives you pleasure and leisure?

The biggest problem for the specialists supporting our hobby has been getting hold of enough stock with high demand and problems with container movements (the cost has gone sky-high which will impact prices).


Worry not Neil, the Evergiven docked in the UK the other day.

Thread: Motorcycle General Discussion
08/08/2021 19:27:49
Posted by duncan webster on 08/08/2021 19:16:06:

How about a RR Pennine for simplicity, 24 cylinder sleeve valve, 46 litres.

You can see the attraction of the first gas turbines, one shaft with a compressor and a turbine, OK there were other bits like fuel and oil pumps, but a lot simpler

Edited By duncan webster on 08/08/2021 19:16:24

Edited By duncan webster on 08/08/2021 19:16:50

I would need training wheels on any motorcycle I rode with that engine in it. wink

08/08/2021 19:23:14

_igp2799.jpgThis laser for a gun has been on the drill mill for years. The beam reflects off a window about ten feet away and back to the face of the laser. It can be easy to get 0.002" repeatability. An extension switch dangles from the rear of the laser and has to be squeezed to switch it on, there is never a danger of running the batteries down.


Thread: Recommended lathe outside protection?
07/08/2021 20:52:18

ACF50, as already advised, used liberally once every couple of months and be sure that no water gets through the tarp. If possible leave an air gap between the tarp and the lathe.

Our drill mill at the museum was left in a back garden for THREE years under a tarp, and was very rusty as a result. It was stripped right down, and I had to replace the lower spindle bearing. The rust was scraped carefully off the bed, which although stained, is none the worse for its treatment, as is the column. The motor was the only part which was kept in a dry place. There is a small ammount of pitting inside the R8 spindle, but not enough to seriously damage it.

Thread: Worktop suitable for small mill
07/08/2021 20:39:12

If you are worried, why not reinforce the entire top with a single fitted piece of 19mm plywood.

07/08/2021 20:28:29

Great to hear the good news, Terry. I would advise renewing both bearings, and use a common lithium high melting point grease. Be sure not to overpack with grease, leave at least 50% air within the quill. Hopefully, removing that label at the front of the head will allow fine tuning of the bearing preload. The correct preload is when running fast for 20 minutes only heats the quill/spindle lukewarm. If the preload is too great, the assembly will overheat very quickly. I have bought bearings from this firm several times and can recommend them. While you are at it, don't forget to check those pulley bearings, and see if that little screw is intended to hold them in place.



Edited By old mart on 07/08/2021 20:30:50

Edited By old mart on 07/08/2021 20:34:50

Thread: Mystery Insert
06/08/2021 19:39:36

A 10mm shank right handed lathe boring bar cut to the required length would be an option, there will be flats top and bottom which might be a problem. If the flats are at the wrong angle, a 12mm bar with the shank turned down to 10mm might be the answer. Tomorrow, I could measure a 12mm bar to see what the measurement across the flats is.

Edited By old mart on 06/08/2021 19:43:00

Thread: Moving vice on mill table....
06/08/2021 19:32:45

It is a bit time consuming, but making tee nuts yourself that fit the slots better and are 50% longer than bought ones is well worth it. They will last a lifetime.

Thread: pH electrodes [advice requested]
06/08/2021 19:03:49

No particular help, I recall having to rinse the probe under a jet of de ionised water and store it in water when not in use. Wiki has some info.


Thread: Moving vice on mill table....
06/08/2021 17:55:24

Good point, MC.

Thread: Custom Thread Sizes
06/08/2021 17:53:47

Left hand threads are nicer to produce as you are threading away from the chuck, and that is safer. You have plenty of time to stop things going to the right. A saddle stop would be a great advantage with lefthand threads as your starting point can be fixed.

06/08/2021 17:48:06

As you have exhausted all of the possibilities, I think its time to put a soft pad under the quill, and use an aluminium drift to gently tap the end of the spindle. I would measure as you progress to see if the tapping does move it. There is no great danger from the tapping as the quill is being removed to overhaul things, ie, new bearings. When the quill is out, the nuts on the spindle are left hand thread.

Thread: Moving vice on mill table....
06/08/2021 17:39:00

I have tee nuts with studding screwed into them specifically for use with vises. The studding is locked into the tee nuts and is just underflush of the bottom of each tee nut. Using studding means that the nut will always tighten down and never hit the end of the thread. The length of studding is made to be lower than any work sitting in the vise.

05/08/2021 21:30:39

Remove the plate from the front of the head, 4 small screws.

Thread: Mystery Insert
05/08/2021 21:09:31

You should check whether the seat could be modified to accept a similar, but more easily available insert. It would need a small solid carbide endmill.

Thread: Custom Thread Sizes
05/08/2021 19:56:42

You have picked a fortunate size of thread to practice on, at least you can easily see what is going on. If you can produce both male and female threads yourself, they can be whatever you like. When I modified a Tom Senior mill spindle to change it from MT2 to R8, using a bottom half from Arc Eurotrade and the original top half from the mill, I screwed them together with a thread that was no particular size, but the dimensions were worked out from the thread depth according to the pitch selected.


05/08/2021 19:46:40

The tapered pulley hub does not affect the removal of the spindle/quill assembly. The drill mill I worked on has never had the pully hub removed. You did not mention whether you had pushed the quill up as far as it would go to inspect the end of the spindle. The splines should run right to the end without any circlips, or screwed on parts, such as might be required for a captive drawbar. The drawbar should be removed before dropping the quill.

Thread: Clarkson Autolock S Type Chuck
05/08/2021 19:33:32

Hopefully, the cutters you have will have their sizes marked on them. The metric ones require the metric collets and the inch/fraction ones, the inch size collets. The same rule applies to the Osborn Titanic type of collets.

Thread: Mystery Insert
05/08/2021 19:27:25

There are many proprietry sizes and shapes of insert which will only fit that manufacturers toolholders.

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