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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: Denham junior Manual
17/08/2020 11:53:12

Hello Martin,

I might be able to help you with the gearing you need to get the pitch of 9 tpi you want to achieve.

You need to arrange change gears of 25 and 50 as drivers, together with 70 and 40 as driven wheels. The "gearbox" needs to be set to the mid position. The pitch generated will be 0.1116 inches which is 8.96 tpi.

I don't know the lathe at all but I assume gears can be connected to each other on the same shaft to give compound ratios.

Arrange 25 as the first gear in the chain to drive 40 which is coupled to 50 to drive 70 as the leadscrew wheel.

Regards Brian

Thread: Dressing a diamong grinding wheel
13/08/2020 08:34:58

Thank you for the link Paul, it was interesting. For a start, I didn't know you could dress diamond wheels

Regards Brian

Thread: Large left hand tap
12/08/2020 16:43:38

Hello Bill,

Have you tried Tracy Tools in Dartmouth?

They are maybe your best bet for an unusual size and in left hand

www.tracytools.com

Regards Brian

Thread: Getting an ML7
12/08/2020 11:25:20

Hello Pete,

I was brought up on a Myford lathe, an ML4 which my Dad bought new in 1945. For a seven year old kid it was a splendid machine and it came to me when he died in 1963.

I used it for much of the turning work on building the Dore Westbury milling machine, changed it for a nicely used ML7 owned by a friend and that too was exchanged for an ML7R; another carefully used lathe from an engineer I got to know quite well and whose work professionally I admired.

The stable has expanded somewhat and is now supported by a nice Smart and Brown Sable, the " posh" clone of the American Southbend lathe and more recently a Churchill Cub, a much larger capacity machine I have restored which was made in Halifax in 1947.

My favourite however is still the Myford and I think you will be only too happy with your new toy. Treat it with respect and care, you will get many years of good service from it.

Regards Brian

Thread: Bandsaw blade speed for brass.
11/08/2020 11:15:57

Hello Robin,

You might find the job goes better and more quietly if you use a cushion of delivery box cardboard beneath the sheet and push the sandwich through as you go.

Regards Brian

Edited By Brian Wood on 11/08/2020 11:16:32

Thread: The making of Steel Balls
05/08/2020 09:19:16

Well found Michael, absolutely fascinating

Regards Brian

Thread: Cutting an M33 x 3.5 thread on my ML7
31/07/2020 20:52:16

Captain Barnacles

I can offer four thread set ups for this pitch

For a Myford ML7 with gearbox the Mandrel gear will be 33 teeth; it replaces the 24 tooth gear of the standard imperial gearing. Match that to 10 TPI selected on the gearbox---the pitch generated will be 3.493 mm

For change wheel machines here are three alternative choices. They all need a 63 tooth wheel in the gear train

Mandrel 38---drives 63 on the first stud which is linked to 55 teeth. Idler(s) will be needed to couple to 30 teeth on the leadscrew. Pitch outcome is 3.51 mm

Mandrel 50---drives 63 on the first stud which is linked to 50 teeth, Again idler(s) will be needed to couple to 36 teeth on the leadscrew. Pitch outcome is 3.499 mm

Mandrel 60---drives 63 teeth on the first stud which is linked to 44 teeth. Once again idlers will be need to couple to 38 teeth on the leadscrew. Pitch outcome 3.501 mm

Others have suggested you practice on easier pitches to start with and use a mandrel handle for manually cutting these coarse threads

Finally you ask what hole size is needed to tap your 33 mm x 3.5 mm thread. It should be 29.5 mm diameter

Kind regards Brian

Edited By Brian Wood on 31/07/2020 20:52:46

Edited By Brian Wood on 31/07/2020 20:53:19

Thread: Today's delivery
30/07/2020 11:19:28

I have had several deliveries of long slender items from metals4U that are taped securely to lengths of timber longer than the items they are protecting before being wrapped in yards of cling film over the whole combination.

Without fail, these arrive intact and undamaged. They use a variety of couriers

Brian

Thread: Hi there
25/07/2020 13:51:40

Welcome aboard Pete--it sounds like you have made many steps already on what is an absorbing and rewarding interest.

Do write up your work, material of that kind is always interesting. In the meantime, enjoy learning as you go along

Regards

Brian from a rather stormy looking day in North Yorkshire

Thread: Making sense of big numbers
24/07/2020 19:43:38

Hello Rod,

Daunting isn't it?

Regards Brian

Thread: ML7 3jaw pratt burnard
19/07/2020 20:01:41

What these methods will not be able to correct is in the case of a badly worn chuck whose jaws are sloppy in the guides, by that I mean capable of being rocked backwards and forwards in the guide. Another situation that defies such correction is in the case of a strained and damaged scroll which will affect the jaw closings in an unpredictable way

The fix for these basket cases is to replace the chuck I'm afraid.

Clearance along the guide is OK, the methods work in that case

Brian.

Thread: Boxford model A gears
18/07/2020 16:32:19

Hello John,

You could well be right, it is several years since I rebuilt the Sabel gearbox and I could easily have forgotten that small but important detail.

Sorry if I have raised your hopes prematurely

Regards Brian

18/07/2020 08:59:07

Hello John,

Here's a suggestion.

There are two combination gears [16/32 teeth] in the doubling gearing part of the gearbox. The noisy one has perhaps had a lot of use and you could perhaps put off the day when action has to be taken by swapping them over

Regards Brian

16/07/2020 18:21:04

John,

Myford gears are 20 DP so they will definitely not mesh with the 16 DP gearbox gears.

Regards Brian

Thread: Jig for hand tapping
16/07/2020 18:11:57

Chris,

For years now I have used the drill chuck that made the tapping hole to grip the tap, taper version [ #1 first of course]

Insert the tap into the hole, apply pressure on the quill and rotate the tap using the chuck key to feed it into the hole, keeping the pressure up to help it.. After a few turns, I lock the quill, undo the chuck and now, as the tap has started truly vertical, transfer the job to the bench vice and complete the tapping in the normal way.

A wooden wedge placed strategically in a table slot will stop the job or vice it is mounted in spinning while the first few engagement turns for the tap are being made

Simple, low tech, quick and effective

Regards Brian

Edit. Ian beat me to it, he clearly types faster than I do

Edited By Brian Wood on 16/07/2020 18:13:33

Thread: Boxford model A gears
16/07/2020 09:18:13

If it's any help, when I overhauled my Smart and Brown Sabel on purchase, [their clone of the Southbend lathe], the gears in the gearbox were all 16 DP and at that age they would be 14.5 degree pressure angle.

I imagine Boxford followed the design in that respect as well.

Regards Brian

Edited By Brian Wood on 16/07/2020 09:18:28

Thread: Trembling laptop
15/07/2020 08:08:14

Hello Gary,

I suspect an earth leakage fault. Test between the panel surround for the keypad and a known good earth.

Regards Brian

Edited By Brian Wood on 15/07/2020 08:08:40

Thread: The 2038 computer bug
12/07/2020 10:54:08

I'm with Jimmy b----I expect it will be something I won't be around any longer to have to bother myself about! Besides, the speed of development in this field will have very probably eliminated that kind of concern and exhausted the finances of the buying public struggling to keep up with the latest trends.

Brian

Thread: Pratt Burnerd chuck
11/07/2020 20:24:41

Hello Mike,

You can change the order in which the jaws are loaded as an alternative. Try 1 - skip- 3- now 2.

I have a chuck with a broken tooth on Jaw 1, it works perfectly well using the sequence 2-3-1

Regards Brian

Thread: 4MM Carbide end mill marks
10/07/2020 18:20:21

Bob,

I would hazard a guess at these marks being evidence of vibration or tool snatching. Rotary table braking to stiffen the action might improve it and a lot will depend of whether you were 'climb' milling

Regards Brian

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