By continuing to use this site, you agree to our use of cookies. Find out more

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: Change Gears Identification
09/08/2021 14:28:48

The model M Smart & Brown used 18DP gears, but they are only likely to be this side of the pond.

Another way to check the teeth is an online calculator.

https://www.technobotsonline.com/gear-size-calculator.html

Edited By old mart on 09/08/2021 14:32:32

Thread: WARCO MAJOR QUILL REMOVAL
09/08/2021 14:23:35

That close up of the lower outer bearing race shows machining marks, not exactly an indicator of quality. I have only replaced the lower bearing in the drill mill, there was a delay in getting an SKF, so I took a chance on a Chinese one, and it was ok. I have been thinking of replacing both bearings in that machine, they are not too expensive and with the front of the head exposed, easy to fine adjust the preload without removing the quill to do it.

Thread: Change Gears Identification
08/08/2021 21:27:57

It would be difficult to use gears of different DP or MOD sizes if the shaft spacing was fixed. I have changed the hard to obtain British Smart & Brown gears for similar tooth size metric ones only because the changewheel positions are adjustable to accept many combinations of gear tooth numbers. If you are thinking of using your spare gears in this context, you may be lucky. These 16DP gears will be slightly bigger for the same tooth counts than your lathes 18DP ones. There would be some measuring to do before committing yourself to making them fit the lathe. You might not have enough combinations of gears to make the change viable.

Thread: WARCO MAJOR QUILL REMOVAL
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).

Neil

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

Thread: WARCO MAJOR QUILL REMOVAL
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.

_igp2798.jpg

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.

Thread: WARCO MAJOR QUILL REMOVAL
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.

https://simplybearings.co.uk/shop/Products-Taper-Roller-Bearings/c4747_5262/index.html

 

 

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.

**LINK**

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.

Thread: WARCO MAJOR QUILL REMOVAL
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.

Thread: WARCO MAJOR QUILL REMOVAL
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.

_igp2435.jpg

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Latest Forum Posts
Support Our Partners
rapid Direct
Dreweatts
emcomachinetools
cowells
Eccentric July 5 2018
JD Metals
walker midge
Warco
Eccentric Engineering
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest