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Member postings for Brian Wood

Here is a list of all the postings Brian Wood has made in our forums. Click on a thread name to jump to the thread.

Thread: Cutting Small Internal Keyways
03/10/2023 09:59:51

I was about to make the same suggestion myself, with the addition of inserting a filler of carbon in the internal slot to prevent silver solder from wicking in

Brian

Thread: Paul newbie from Lichfield
01/10/2023 18:45:39

Hello Paul,

I'm sure someone will be happy to help.

I live in North Yorkshire and have had to hand in my driving licence as a result of eyesight deficiences [ my choice in trying to meet increasingly demanding driving conditions] , but if you wish to travel "Oop Norf" instead I would be glad to pass on the kind of stuff you are looking for.

Regards

Brian

Thread: 9/16 nut help!
29/09/2023 09:36:00

Trevor and Noel,

Thank you for the information, I didn't know if ! they even existed.

Kind regards

Brian

28/09/2023 10:40:13

Where from Noel?

Brian

25/09/2023 10:46:30

Hello Margaret and others,

I don't have an operational lathe at the moment otherwise I would have been in a position to make a special purpose nut for this job. What I can do though, which might be helpful to someone else willing to do so is provide the screw cutting parameters for a "mixed race" nut, based on Myford equipment.

9/16 inch equates to 14.1 mm and 18 TPI equates to a metric pitch of 1.41 mm

Gearing for Myford for that pitch will be a 25T driver coupled through 19 TPI for a gearbox lathe. Resulting pitch is 1.393 mm

For non gearbox lathes [including ML10 and Super10] the gearing is 25 x 50 as drivers, with 45 x 63 as driven gears. The pitch in this set up will be 1.4 mm almost exactly

So we finish up with an M14 sized nut threaded to 60 degree metric standards having a pitch of 1.4 mm.

I hope that is useful information

Regards Brian

Thread: Thumb screw
22/09/2023 09:53:02

I would be inclined to drill down the joint between the head of the cap screw and knurled outer piece and lock the two together with a suitable size of pin.

Brian

Thread: Information
20/09/2023 09:43:22

Mark,

Are these new spindles to run in new white metal bearings?

If so, a realistic top speed for that combination, from memory, is something in the order of 600 rpm. The lathe will tolerate brief runs above that speed but for a good life from the bearings that should be regarded is a working limit.

Regards

Brian

Thread: Lathe toolpost stud thread repair ideas
12/09/2023 14:24:59

Carl,

All we can do is offer advice on what we see. You are at the sharp end and ultimately the way ahead will be what you feel comfortable with.

Either way, good luck

Brian

12/09/2023 12:45:35

Hello Carl,

Clive's post above seems to be the most sensible option and I certainly endorse his recommendation for holding the filler block with countersunk screws from below, as well as relieving any threading to the upper flat surface to prevent swelling to interfere with an otherwise flat surface

Incidentally, you have the Cub Mk3A which came as standard with the full Norton gearbox. I don't know the age of your lathe but if the Serial number finishes in 49 or higher it probably has the uprated spindle clutch.

Mine is a salvage job from a Steptoe like scrap yard; it is the Cub Mk3 with the simpler three selector semi-Norton box, making the lathe effectively a change wheel machine with 3 variants on each pitch selection. It was made in 1947 and comes with the Tee slotted insert across the top-slide to carry the 3/4 inch diameter tool post and indexing 4 way tool holder. The insert, tool post and 4 way holder are all hardened.

I would like to find another full gearbox as I am convinced I could do a straight swap with mine, but like hen's teeth they are rare beasts.

I hope you can put yours right, it is certainly not so as it stands.

Regards Brian

Thread: Bandsaw Blade Tension
31/08/2023 14:42:09

Martin,

I see your problem although to be frank, I imagine getting blade tension on blades of 6 inch depth or so is more a question of trying to get enough!

Brian

31/08/2023 14:06:49

Martin,

I have successfully used a musical note approach for years, but don't ask me what sort of frequency I choose, it is well above a dull thud to something a lot more pleasing.

If that is any kind of guide for you it might save you some angst and cost!

Regards Brian

Thread: Bridgeport Issue
16/08/2023 10:29:48

Hello Michael,

That sounds more like dirty points on the centrifugal switch within the motor itself than a capacitor fault. It is a common enough problem with single phase motors that have had a lot of starts. On starting, the motor start winding is energised to get the rotor up to speed which in turn opens the centrifugal switch to allow the main run winding to handle the running load. There is always a spark at the contacts when this happens and over time the points become pitted and oxidised.

It is a mechanical issue and it means taking the motor off, opening it to get to the switch inside and cleaning the points with a folded strip of emery cloth so that abrasive is to the outside. Be sure to clean up afterwards as you will have exposed one of the rotor bearings, easily protected with some strategically placed rag. A drop of oil on the bearings would be a useful bit of maintenance while you have the chance

Hopefully that will put things right for you

Regards Brian

Thread: Cutting a 1 1/8 fine pitch thread into PTFE!
09/08/2023 19:34:28

Simpler still would be to aim at 8 tpi, bearing in mind what Andrew Johnson has to say about the material. The gearing then is 25 on the leadscrew directly coupled to the spindle gear of 25T with idlers linking the chain

Brian

09/08/2023 17:58:04

Josh could try for a 2.5 mm pitch thread, with the following set up:-

Fixed spindle gear 25 drives 25 on the 1st stud, that is linked to a 50 that drives a 70 on the leadscrew. As before, he will need an idler on the 2nd stud to complete the gear train and again a 40T gear might be suitable

The resulting pitch will be 2.445mm

Regards Brian

09/08/2023 17:47:57

Good advice Andrew. I will amend my thread pitch gearing accordingly and come back with something else. My sample of PTFE may not be typical.

Regards Brian

09/08/2023 17:37:31

PTFE is a fairly rigid plastic which I think might be able to support a thread of 1.25 mm pitch. Gears needed for the gear train are 50, 55 and 70 set out as follows:-

Ist stud Driven 50, linked to Driver 55

2nd stud will need a suitable size idler to link the chain to the leadscrew---maybe 40 would be about right

Leadscrew 70

Result will be 1.247 mm pitch. very close to 1.25 as a target.

ML 10 lathes are unusual in that they have a permanent fixed 25T gear on the spindle, which in this case will need to mesh with the 50T wheel

Standard Myford change wheels are readily available

Regards Brian

Thread: Old Bee-Hives?
05/08/2023 17:52:55

As an ex bee keeper, Samsaranda is correct. When it came to harvesting, the colony was sacrificed and a lot of bees finished up in the honey. The modern frames are a lot kinder to the inhabitants and once the honey has been spun out of the frames, having cut off the capping, they are returned to the bees who will then clean them up ad fill them with sugar syrup that is fed to them so that they can survive the colder months.

I have somewhat simplified the process, but that is the essence of it.

Brian

Thread: Axminster 300w horizontal bandsaw noises
02/08/2023 15:50:44

Hello Jon,

Glad to hear you are sorted. I think cheap bearings will be quite adequate for the application.

However, you do puzzle me with the stated number involved, 9 you say. My saw and commercial saws I have used only have a total of 6, namely one each side of the blade and one above for the back of the blade to run against for each guide station making a total of 6. Generally there is no need to replace them unless they have seized, if they rotate smoothly that is good enough.

Regards Brian

Thread: 1950 Myford
30/07/2023 18:10:18

Myford grey

Thread: Axminster 300w horizontal bandsaw noises
30/07/2023 08:36:26

Hello Jon,

Your saw is a much younger development from mine, bought perhaps 20 years ago or more from Axminster, it has been through the mill so to speak in correcting bad workmanship, poor fits, running faults and so on.

The usual way of tracking odd noises is to eliminate likely causes. Start by removing the saw blade and running the motor and drive on their own. Check there is oil in the reduction gearbox. Ease the blade guides to allow the blade to slide freely.

I aligned the blade guides by a tensioned wire instead of the blade, I suspect yours are slotted rather than ball bearings in my case which needed machining to correct the unmachined cast faces that relied on screw pressure to hold them together, but the guiding effects will be equivalent.

It could well sound better after such laying on of hands.

Regards Brian

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