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Member postings for Doug Bauld

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

Thread: Metric Screwcutting on Super 7B with 127 Tooth gear
01/11/2021 01:58:58

Gearing of Lathes for Screwcutting by Brian Wood. ISBN 978-1-78500-250-2. Covers this topic extremely well, Chapters 1 & 2 .


Thread: Change Gears Identification
10/08/2021 07:54:48

I have just checked with the Logan No 850 Turret came furnished with 17 gears (6 on the lathe and 11 extra ) and 7/16 face width . I have the 11 extra gears with 7/16 face width. Hopefully that is what I have.

Edited By Doug Bauld on 10/08/2021 08:07:10

Edited By Doug Bauld on 10/08/2021 08:08:06

10/08/2021 07:13:49

Thank you Gentleman for your technical input much appreciated, I think that Jason B may have nailed it as a couple of the gears have cast lettering on the reverse side, L A , 211, K6,on the 56T and the 64T LA, 213, and a K, the 24T has LA, 02, and K, very difficult to see using a Opti Visor.

20210808_204150 (1).jpg

No I had no intention of meshing the 16DP with the 18DP.

Brian good to hear from you, would certainly like to obtain your book, you have my email ?.

Brian also knows that I also have another SBL 9A, 4 1/2, with QC gear box , this I acquired soon after the SBL 9B that was in a very neglected state and no attachments as the 9A came with 90% of factory accessories and very good condition.

On this side of the pond Myfords are extremely rare, they were mostly brought in by British citizens, I picked up a ML10 at a Auction as no one recognize it, came with many extras, full set of change gears.

I thank you all once again for your help as I would like to pass these set of gears on to a member in the hobby that has the lathe without the change gears as I to have been assisted by members of the society.

Doug in Canada. B.C.

08/08/2021 20:42:19

Would like to have these gears identified please and to what lathe that they may belong.




They appear to be unused and very fine condition of fine grain casting of steel. I do have a SBL 9 B that does not have a set if change gears, these may be able to be adapted ?. SBL are 18 DP I think, don't have a gauge. your thoughts please, otherwise I will be considering a swap trade. Doug

Thread: Link
08/08/2021 02:24:20

Your help will be much appreciated, need to know how one goes about creating a link to a topic or directing to a specific site.

Thanks Doug.

Thread: Shaft Steel Material Selection
27/06/2020 06:42:55

Mr Reese thanks very much for the Link , it certainly cleared up the issues I was thinking of and top information added to my education.

The idler pulley arrangement is part of a clutching system driven by a 15 Hp 4 cycle engine , I would expect top RPM to be 1,725 but most of the time it operates 2/3 to 3/4 speed in outdoor environment open field and the only practical method of lubrication is threw a grease zerk an oil;pot would collect much contaminants tho I do like the idea , mounting may curate some issues ?.

The drill rod I mentioned earlier comes from the supplier oil quenched and ground no spec as to the BHN or RH, I would only be machining to length and cutting key way slots, I am a little concerned about the as supplied ground finish that the Torrington needle bearings will be running on and should I polish the contact area. ?.

I do have a length of 3/4 ground shafting that is ment for sintered bronze bearings application, maybe I should try it?

25/06/2020 21:25:43

Your professional advice as to the type of steel to use in replacing the damaged one that has been galled by Torrington needle roller beating due to the lack of insufficient lubrication.

I am considering Drill; rod oil quenched with a finish ground tolerance of 0.0005" +\- tolerance ( G.B Silver steel).

All input is much appreciated, thanks Doug in Canada.20200625_114800.jpg

Thread: cast iron piston rings
09/01/2018 03:29:33

Sam this may help,

also an article just on that in the latest The Home Shop Machinist Jan / Feb 2018. Vol 37. No1 page 20. By Ted Hansen an Englishman I believe and a very good article.

Cheers and Good Luck in your search.

Doug in Canada.

Thread: Why don't we make models of things like this?
06/03/2017 06:01:29

Neil does have a very good point, I for one will not Knock It. Just try winding the coils by hand and laying them for correct connection to the commutator ?

Thread: 19TPI on South Bend Lathe
12/10/2014 18:51:49

Thank you Gentleman, I am enjoying the interest and input to my project. I would prefer to achieve the job by using change gears. I do also have another SBL9 without the quick change gear box, in pieces at the moment as it is in dire need of serious service. This is probably the machine that I should be setting up to do the job. I have came across this 19 TPI several times more recently with Chinese manufactured products. It is not common in North America and seems to appear first in the English system of manufacturing. My lathes are all Imperial with 8TPI lead screw. Thanks to all Doug in Canada

11/10/2014 03:24:33

My lathe is a SBL with a quick change box, it will do 18 and 20TPI nothing listed for 19TPI. I do have transposing gears. The closest Metric equivalent is 1.30mm. Not good enough for the project at hand. All helpful hints and idears much appreciated. Thank's Doug in Canada.

Thread: Trepanning
19/05/2014 07:53:26

I require ideas as to cutting a 3 5/8" hole in 4 x 4 x 1/2" mild plate. Tool design, Speed. Tooling will be 1/4 square HSS. Lathe is 9 inch SBL.

Thanks for any help Doug in Canada.

Thread: Three Jaw Independent Chuck
12/08/2013 21:14:08

My Mistery is Solved.

Many Thanks to those gentleman that responded professionly and constructivly, I particuly apreciate the input of discussion from both Michael and JasonB eith a high 5 to Michael for the look at This, that forced me to disect the Chuck and solved the mistery.

Thanks to all from Doug in Canada.


12/08/2013 19:59:18

Gentleman I have mostly every chuck avaible, this one is close to being an odball.

My interest is in the Practical Theory and purpose design of this Chuck and it's purpose use.

Your technical theries and history of this chuck is required and appreciated.

Doug in Canada

12/08/2013 19:13:57

3 Jaw Ind Ckimgp0863.jpg3 Jaw Ind Ck3 Jaw Ind CkThank's Gentleman for your interest.

Some old very experianced Machinist have observed this Chuck with their Jew on the floor, one said that he feels that he had seen one while in the Navy but only vague about it.

This I beleave to be American and may possibly be associated with a Rotary Indexer for possibly Ecentric and Cam Grinding/Cutting??

Hear are the Photo,s as requested.

12/08/2013 02:37:37

Looking for any information on the use and and avantage of the a Three jaw's purpose.

I have one.

any coment appreciated.

Doug in Canada.

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