Member postings for John Burridge

I quite often need to drill unbrako bolts and grub screws or bolts of a similar hardness, I would drill first with a centre drill then a cobalt drill but would use a cutting oil like,Molyslip extrme pressure cutting oil,I might smoke a little but the drill would not have a problem cutting and staying share.

MWF (Metalworking Fluid)

MOLYSLIP MWF is a concentrated neat cutting fluid containing a unique oil-soluble molybdenum compound together with extreme pressure anti-weld additives. Helps give greater cutting accuracy and prolonged tool life.

There are many other cutting oils but here is one that I use mostly.

Regards

John

Most of these Firms that do parting tools 1.5mm width or under some are parting tools some are grooving tips but would do the job I would think.

http://www.sandvik.coromant.com/sitecollectiondocuments/downloads/global/technical%20guides/en-gb/c-1029-055.pdf

http://www.phorn.co.uk/products/grooving/

http://www.kennametal.com/content/dam/kennametal/kennametal/common/Resources/Catalogs-Literature/Metalworking/Master%20Catalog%20-%20Inch%20Sections/A-11-02679_MasterCat_stationary_groove_cutoff_inch.pdf

http://www.iscar.co.uk/Catalogs/zip/GrooveTurn%20Catalog/GrooveTurn.pdf

There are other manufacturers which would do tip for parting off but here's a start

John

college engineering have square section silver steel in their catalogue and web site.

john

Hi to all,

I am trying to find some very unusal taps and dies, the size required is 1/16" X 62 TPI and they are used in Sturmey archer hub gears. The thread was the old CEI Cycle Engineer Insturtute which used to use this size for cut threads for spokes before thread rolling started.

I have tried Tracy Tools which most times they have what you want they have 1/16" taps in 60 and 64 TPI but unfortunatly 62TPI.

I have looked at the differances between British teeth per inch and metric pitches but there is nothing that come even close.

The part in the SA hub is a cross nut and the toggle chain and joining rod from the other side bolt up to this part and clamp it tight so the hub can make gear selection,

I have recently re-read The Harris book on steam engines and at the last chapter he mentions a full size marine steam engine which he says was in the Engineer magazine and he give numbers of the issue 20-6-13 which I presume is the date issue.

It is a twin two cylinder Non-condensing and uses Stuart Turners cylinders.

It mainly seem to be made of mild steel plate and bars for the base plates and the columns, the crank can either be machined from the solid or made up and pinned together,It also mentions pumps for the feed and lubrication.

Has anyone either made this engine or have the drawings for it as yet I can not seem to trace it anywhere

Regards

John

When I started My apprentership at The Rover Car company they were still making cars and the Rover 2000 and 3500P6 and P5 and the SD1 along with the remaining TR7 and 8's this was only back in 1976 then they moved the cars down to Cowley in Oxfordshire, then Soilhull and all the other 17plants around Birmingham became LandRover then all they produced were 4X4 vehicles

I have read the latest article on the nibbler which I think is very good, Only one thing seem wrong, The mention of the 3/8" X 20TPI thread it should normally be either 3/8" X 24TPI or on bigger drills 1/2 X 20 TPI

3/8" X 20 Is BSF and not the standard 3/8 and 1/2 UNF threads

Regards

John B

Typo

Edited By John Stevenson on 07/05/2014 19:17:21

The thread for bicycles I believe were set up as a standard first by BSA most of the threads being 26TPI,This then got accepted by CEI (cycle engineers Industry)which evolved into the British standard for cycles BSC.

Most of the threads except for Headsets and bottom brackets which used the 24 TPI range and the 9/16" X 20 tpi which is the grenral pedal thread.

Strangely enough the Italian Campagnolo enlarged the wheel spindle threads from 5/16"(8.00mm)X26TPI to 9mm and the Back spindle thread from 3/8"(9.5mm) to 10mm so that is why you get metric outside diameter with a british Teeth Per Inch (TPI)

Regards

John

I have been tasked by SHMBO to restore a brass bed which she picked up for nothing.

The bed is screwed together with unusual threads ie: 1/4" X 22TPI thread(5/16" X 22 TPI being BSF) both left hand and right hand.

I have some of the screws and nuts missing and have made some studding by screw cutting the nuts I need to tap.

I have searched the internet for non standard threads and even Tracy tools don't keep this size in right hand nor left hand and the price is prohibitive to have some specially made.

So I have thought about making taps and then making a die.

When I have usually made taps and dies I have used silver steel and gauge plate.

What material do other model engineers make there taps and dies out of.

I have made taps at work out of HSS but don't have the heat treatment plant that I once had available, So do I use another material which I can harden but also have a good tough core strength which is hard to achieve with the standard silver steel.

I could case harden and this would probably do the job after I have cut the flutes in the tap.

Regards

John

Tracy tools do up to an inch end mills with a 5/8" 16mm shank

John

Hi Paul,

Do you know anyone with a 50mm Rotabroach type cutter they work like a trapaning type cutter and leave a slug of metal in the centre they have a spring loaded centre and an a ejector spring that when finished removes the inner slug like the ones you see with a hole saw,the finish is quite good and keeps to size with ease.

Regards

John

The show was great with lots of good models well made and finished, almost all interests were covered.

Standards of model making is still there all we need to do is interest the next generation!!

Prices for everything these days is going up and up and the money we all have because of the re-session is limited, The prices of the trade stands is going up but so is everything else, I would say in the last 5 years the cost of living in real terms has risen about 20% so even though you can't buy those cheapys at the shows that you ounce could the range of products is ever increasing and some of the trade stands are bringing back things which we used to make in the UK by having them made in the far east at cheaper prices and the standard of quality/material choice and correct heat-treatment are making these products almost as good as when we made them here, But at a cheaper cost which if we require are within our budgets.

I thought that even though some of the larger trade stands we absent there were a few more with other things to offer.

As well as the College engineering/Jacob's hobbing machine have you had a look on the net at the Martin version which has improvements for the spindles being mounted on roller bearings and a inbuilt tray for the swarf, Both of the suppliers you can buy just the drawings and you could combine the best feachers of both machines also being in Australia and would need to either fabricate or make patterns you could scale up so you can cut larger gears.

The Jacob's gear hobber was covered in the British MEW mag some year ago including the making and relieving of hobs which is usefull to save the expence.

Hi Revilo,

If you have a look on the Tom Senior Yahoo group site it explains how to strip the head and the adjustment and preload you will need to do when rebuilding the head.

Regards

John

Hi Steve,

Delapena still exsist as a company in Glostershire you could try them direct alternatively try Tony Griffiths site for a manual at www.lathes.co.uk

Regards John

If you look at the first book in the workshop pratice series it explains the use of salt baths for hardening and tempering.

As an apprentice i used cyanide salt baths for tempering materials,now because of health and safety most heat traetment is done in vacuum or gas filled furnesses taking away ythe dangers of materials and processe we are no longer aload to use.

While on the subject of the REME moving from Arborfield,Does anyone know if they will be having a clear out of old stock,they keep things back to the year dot and can almost provide spares back to Victorian times.

John

As has been said I think they are for motor cycle or bicyle spoke threads,if they are the very old cut rather than rolled spoke thread they might be 62 teeth per inch which was CEI cycle engineering intertute alternatively they may be the later BSCbritish standard cyle thread and used for cleaning rather than cutting(they would be rolled given a lot stonger thread)and would be 56TPI teeth per inch,

Or they might be something totally different!!

John

Hi Adrian,

Can you put some pictures of the shaper on the site then we can see what your talking about and what we can do to help you with this new clutch.

you could use a cone clutch or an idler to tension the belt and would engage and disengauge when the tensioner was put into place and tension applied

The inverter is proberly the simplist way for you to get variable speed but if price is an issue you could use two sets of stepped pullies

I am wanting to use the clutch arrangment for another attachment to be used in the tail stock, has anyone made the die holder and could explane the principal and some dimentions Please

I saw a tailstock die holder of the John Paynes design many years ago at one of the shows.