Conversion Chart

[David Clark 13Participant @davidclark13]

Hi David

Not quite sure what you are suggesting.

regards David

[DMBParticipant @dmb]

Hi David,

May I make a suggestion. Last time, chart was in a 4 page pull-out and unfold format, which resulted in some figures being right on the fold creases and quickly destroyed by constant folding or in cutting up. If chart is planned as separate A4 panels, they can be easily cut apart and laminated.

John

[David HaynesParticipant @davidhaynes53962]

Hi David,

I thought that it would prevent missing information if you copied the headings of your proposed chart to the ME forum before you printed the chart. Please ignore my comment about using 'paste special', I was not thinking straight – not relevant.

The list so far seems to consist of (with extras I have added):

chart is planned as separate A4 panels

Metric to IMP conversion. SWG sizes and conversions

Drills: letters / nos./ fractions / metric.

Threads: BA / 32T / 40T / Brass26T / Gas / Metric (Fine or Fine and Coarse??)

(maybe also BSF / BSW).

Possibly also TPI of BA

Tapping (for strong & weak threads – % depth of thread) and clearance drill sizes

Machine cutting speed for different materials and diameters

Regards

David

[BazyleParticipant @bazyle]

Maybe BSF/BSW? possibly TPI?

One of the major uses I have is to identify a random bolt from it's TPI. Model Engineers will often deal with BSF/BSW more so than Brass and Gas threads.

Also need to add UNC/UNF for our foreign readers and these often appear when stripping down non-uk equipment..

Tapping drill is only needed for one but clearly declared depth as anyone who can't decide to go up or down a bit from that is not safe near sharp tools and moving machines.

Edited By Bazyle on 25/03/2013 10:36:38

[Gary WoodingParticipant @garywooding25363]

If anybody is interested, some years ago I constructed a conversion chart for members of my ME club. It's in the form of a 2-page PDF that can be downloaded from…

http://kvisit.com/S4IvyAg

The tapping drill sizes were calculated with a 65% engagement for diameters up to about 3/8" or 9.5mm, and 75% for larger.

You can print it any size you like – I keep laminated A6 double sided versions near my computer desk and in the workshop.

Edited By Gary Wooding on 25/03/2013 11:29:52

[SteambuffParticipant @steambuff]

Gary,

You have to register/sign in to access that site?

David

The two things I would be like to see included are the details for BA (0 to 14) and ME threads (40, 32 and 26 tpi) – (TPI, Tapping diameter, Clearance diameter and diameter for threading)

Dave

[Gary WoodingParticipant @garywooding25363]

Sorry about that, I thought I'd set public sharing, but apparently it wasn't accepted. It should be OK now.

 

Edited By Gary Wooding on 25/03/2013 14:33:44

[Roger MountainParticipant @rogermountain33705]

Hi,

I use a spread sheet, it is a bit of a work in progress as I add new threads as I come across them. I printed it out on A4 sheets as a wall chart before realising it was bigger than the available wall space so I just leave it on the lap top in the workshop now.

Regards, Roger

[Trevor Drabble 1Participant @trevordrabble1]

Gents , May I suggest you will find much of the information you require in a convenient form on a small (4" dia) double sided plastic disc with a rotating arm available from Monument Tools http://www.monumenthandtools.co.uk Part No (MON530J) for £4.25. I have no affiliation with the company other than a satisfied customer.

[DMBParticipant @dmb]

It would seem that DC-1 now has a major problem; what to put in and what to leave out of his wallchart. To be of any use, print size has to be reasonable but we all (including myself) have listed our own pet needs. I can only suggest a whole series of A4 panels of decent – sized figures, covering most wants. Most BA users will probably want nearest possible clearing sizes drill for BA. All the Whitworth – based threads (BSW/BSF/ME32T/ME40T/Brass26T) , "thread size" is also clearing or basis of calculating same, so no need to include. I said Gas as I think 7 1/4G loco builders might use some for pipe-work?? Gary`s suggestion for 65/75% engagement drills according to thread dia. seems a good idea and would help to keep down number of columns.

John

Edited By DMB on 25/03/2013 17:24:28

[Speedy Builder5Participant @speedybuilder5]

Well done Trevor D. You have answered my question as the 'disc' you highlight from Monument Tools includes metric threads – problem is that the postage is more than the disc, and I hate to think how much it would be to France. The Monument disc is just like the SHETACK disc, brought up to date.

Do other ME users use these disc calculators and do they find them usefull ?

[jwbParticipant @jwb]

I've got the Shetack 1938 edition which I bought on the 1950s. It's in frequent use to this day.

One side goes from 0.0135in to 0.232in diameter, with all the associated BA, Whit, BSF, and Metric thread data, together with letter and number drill sizes, inch and millimetre diameters, and SWG. Ditto for the other side from 0.234in to 1.000in but the threads are Gas, Whit, BSF and Metric.

There's only one thing that has gone wrong with it over the years and that is that the engraved characters have gradually got smaller and smaller, yet I have to hold it further away to read it (joke).

It's somewhat disconcerting to see things become antiques in one's own lifetime.

John

[Sub MandrelParticipant @submandrel]

One of the most useful things I have seen is a graph with rpm up the Y axis and diameter along the x-axis. Several lines represent different metals, each line representing a speed in feet per minute.

The lines should use conservative speeds reflecting HSS tools on light lathes.

Used intelligently with awareness that speeds aren't gospel and that judgement has a role too, it is a handy guide to get speeds in the right ballpark, especially for the less experienced.

Easier to read than a table.

Neil

[AESParticipant @aes]

@David Clark 1:

Just caught up with this thread. I would definitely vote YES for such tables/charts to be published in MEW.

I have for some time been collecting such data from various sources and whikle away from home found the time to "collate" it all into a 2 page A4 Word doc. David I have sent you a copy in -pdf format as it MAY help you and as it does answer some of the "wish list" items posted above.

Also Sub Mandrel's suggestion of "look up graphs" is excellent for some types of data too. I believe that officially such graphics are called nomograms (or something similar). The now defunct magazine "Aeromodeller" published some covering stuff like balsa wood weights/densities, etc, back in the early '60s. Very useful.

Krgds

AES

[BazyleParticipant @bazyle]

Thanks for making your chart available Gary. Interesting presentation.

I think it demonstrates the advantage of the old printed charrts over a spreadsheet or photocopy – namely some colour. (no I don't have a colour printer or copier, even at work)

[I.M. OUTAHEREParticipant @i-m-outahere]

Fantastic idea David !

There are literally hundreds of data sheets you could use and many are relevant to model engineering and some more towards general engineering etc i'm always a little cautious of things like speed and feed charts as many are for industrial use and not really suited to our smaller machines . Maybe there are some charts more suited to these machines ?

I have the set that was produced by MEW a few years back and while they have been handy the size was anoying as i did not have room for the wall chart format so the A4 size would be ideal and i could put them into a spiral binder .

Probably going out on a limb here but maybe this could be a series of data sheets run monthly in both MEW & ME that can be built into the ultimate data book of data sheets for model engineers with a nice binder available at the end ?

Other than the usuall drilling / tapping charts & cutting tool angles there are a few i think could be usefull.

Dividing charts and relevant info .

Gear cutting info .

Sine/ cosine and general trigonometry tables.

Press and slip fit for roller bearings.

Lathe spindle nose thread dimensions for common lathes used by ME's.

Morse taper info .

There must be some stuff that I/C engine , loco , aircraft , boat or ship buiders could add to this even though maybe not of use to every one it is always usefull to have or interesting to read and one never knows when a "OH SO THAT 'S WHAT THAT MEANS " moment is just around the corner !

You could even add a Dictionary so i can learn how to spell !

Ian

 

 

Edited By SLOTDRILLER on 26/03/2013 05:41:50

[SpringbokParticipant @springbok]

David
Also the ME taps and dies mentioned in most drawings.

Bob

[David Clark 13Participant @davidclark13]

Hi There

This is obviously a popular idea.

It is all systems go.

I think two charts on the centre pages so readers can photocopy as A3 or A4 is the way to go.

Fortunately I have quite a few charts and things I can use as a basis without infringing copyright as long as I check them as correct. You can't really copyright a thread depth dimension for instance.

I will expand the remit a bit to include other useful information such as screwcutting etc. Hole centres for pitching out on a PCD springs to mind. Solution of triangles as mentioned by someone.

I will make sure each chart ingludes the issue number so you don't have to search for it when it gets dirty or otherwise defaced.

Any other suggestions welcome.

I would also like someone who would be prepared to double check the charts before publication.

regards David

regards David

[David Clark 13Participant @davidclark13]

Hi There

Anyone got any information on the ME thread series.

I have that from the ME handbook by Tubal Cain but would like a couple of alternative versions and any other information about this thread.

What depth of thread engagement do you use?

For what purpose would you use an ME thread other than boiler fittings and pipe connections etc.

Also, similar information on BA sizes would be useful.

regards David

[Les Jones 1Participant @lesjones1]

Hi David,
Here is one table as a result of Googling "model engineering threads"

Here is a table of BA thread data.

Les.

[DMBParticipant @dmb]

Hi David,

If you produce a number of A4 panels, perhaps 4 per issue, a banner – type advert could be put along bottom edge and as someone else said, be there till chart fell to pieces. Obvious one = MyHobbyStore or MyTimeMedia BUT charge for some to pay for it! Perhaps a general castings house like College Engrg and Chronos,Warco,RDG, G&M Tools, " Uncle Tom Cobleigh & all!. " Good luck with it, looking forward to seeing results.

John

[Michael GilliganParticipant @michaelgilligan61133]

Posted by DMB on 26/03/2013 16:24:36:

Hi David,

If you produce a number of A4 panels, perhaps 4 per issue, a banner – type advert could be put along bottom edge and as someone else said, be there till chart fell to pieces. Obvious one = MyHobbyStore or MyTimeMedia BUT charge for some to pay for it! Perhaps a general castings house like College Engrg and Chronos,Warco,RDG, G&M Tools, " Uncle Tom Cobleigh & all!. " Good luck with it, looking forward to seeing results.

John

.

John,

Sorry to appear mean, but …

That's fine; provided that the pages are additional to the editorial content.

However; if they are counted within the editorial content, then "someone" is already paying for it [i.e. the purchaser of the magazine!]

MichaelG.

David … Could you please clarify ?

[David Clark 13Participant @davidclark13]

Hi There

They would be from the existing 68 pages but that does not stop us charging for sponsorship.

It does take time to create them.

regards David

[Michael GilliganParticipant @michaelgilligan61133]

As I feared

MichaelG.

[David Clark 13Participant @davidclark13]

Can't be helped.

I can't increase the page count by 16 as the pages are printed in multiples of 16 excluding the cover.

regards david

Edited By David Clark 1 on 26/03/2013 17:15:30

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