Conversion Chart

Hi Coal burner

I will do that.

Remind me when it is in the magazine and I will upload it for subscribers only.

regards David

Hi Springbok

As it will be for suscribers only, it would be available to me and mew readers.

regards David

I second Bob's suggestion of including depth of thread.

Neil

Hi David,

This idea of your seems to have been a winner. Just one thought, perhaps before you put ink to paper, you give a list of the items to be included. Not a finished format, just a paragraph that you copied from your proposed chart and 'paste special - unformated text' into a paragraph.

It would be a shame for something to be missed when there is such a forum of MEs.

David

Hi David

Not quite sure what you are suggesting.

regards David

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

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

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

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

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

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

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

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 www.monumenthandtools.co.uk Part No (MON530J) for £4.25. I have no affiliation with the company other than a satisfied customer.

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

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 ?

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

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

@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

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)

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