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Member postings for Nigel McBurney 1

Here is a list of all the postings Nigel McBurney 1 has made in our forums. Click on a thread name to jump to the thread.

Thread: Myford 254 thread dial indicator
14/04/2020 17:18:04

ref DC31ks comment on chinese gear cutters having the number of cutter relative to the no of teeth gear it will cut are reversed,does this reversal apply to metric cutters compared to old imperial cutter system.,if so In Machinerys handbook 23 rd edition page 1794 there is a note stating that the numbering of module gear gear cutters is reversed compared to the imperial system.

Thread: Correct boring with a steady - advice please :-)
13/04/2020 12:15:54

Thats and awful lot of taper, and assuming your lathe usually turns true,the fault lies with steady and spring in the boring bar, The steady pads should always run on a true machined surface,and be careful when tightenind the pad screws they must only just touch the work,too much pressure and the work can be pushed to one side and therefore out of true.plus they must be kept lubricated when the work is revolving ,use some oil and squirt with an oil can.One cause of a severe taper when boring is swarf building up in a " birdsnest "around the tool and the bar and deflecting the bar away from the work .I would be using a bar at least twice the diameter,made from silver steel with a hole in the bar to take the toolbit, If the bit only protrudes a small distance from the bar then swarf quickly builds up ,particularly with materials that produce long strings of swarf ie steel and ali ,also check that the boring tool bit has adequate clearance. A pecularity of the steady is that if the three steady pads are set up so that they are not in in line with the centre line of the lathe,the work will work or "walk "out of the chuck,even if you are convinced that the set up is true keep an eye on the chuck end of work to make sure it is still well in the jaws, I have seen 'Walking" as it used to be called but never seen or experienced work come out the jaws. Usually caused by one pad screwed in too much and deflecting the work off centre and the other pads then screwed in .When working with a steady,lubrication is essential to avoid the pads marking the workpiece,if a near finished work piece has to be set up in a steady then some times it possible to make a collar ,which can be secured with grub screws, the collar is then set up true by either adjusting the grubscrews or machining the collar,to avoid marking the work piece small brass slugs can be fitted under the grub screws.Well theres some info on steadies but I would bet that the bar is deflected by birds nesting build up of swarf,I have seen large buildups of swarf put sufficient pressure on the business end of the bar to actually move the toolholder.

Thread: How to fit a new gasket to oil bath table feed?
12/04/2020 10:36:02

Forget the instant gasket,goes off quickly,most is usually wasted and expensive ,also instant gasket goes everywhere inside when squeezed and has been known to bung up oilways and get to places where it should not be, Comments like get with times and use modern sealants,its better to use methods that were available at the time of manufacture,though unfortuneatly some of the best sealants are no longer manufactured,ie Osotite,the various Hermatites,not because they were no goodbut because our engineering industries have collapsed the the demand disappeared,plus cars are now so reliable ,very few people take their cars or motorbikes to bits and repair them.A solution to the end plate sealing is to aquire some .5 mm gasket paper from a motor factor,our local factor sells gasket paper which is very tough and does not tear quickly,and and seal each side with blue hylomar,or do what garage mechanics do smear the gasket with grease, In my youth I thought using grease was not good practice as I had been shown to use Osotite and either gasket paper or if the machined surfaces were in good condition just Osotite with no gasket on machine tools.Years later I was involved with a friend who supplied recon motor parts to the trade ,mainly commercial water pumps and steering gears and he fitted thousands of thin paper gaskets smeared with ordinary light grease,with no complaints about leaks. On machine tools the faces to be sealed must be clean and flat and no burrs around the edges,rubb an oilstone over the surface,Leaks can be caused by areas around tapped holes where the holes were not sufficiently counter sunk prior to tapping and tightening the bolt causes the theads to lift a few thou and stop the mating plate sitting down, also there can be muck and old sealant around the base of studs which again can prevent the mating part from seating .to clean the muck from around a stud i use the point of a three cornered scraper.In the full size world I sometimes I get work where steam and water flanges leak ,the flanges are usually banana shaped where steam drivers in the past have had leaks in the past and used very thick gacket material bolted them up tight ,which only bend the flange fae a bit more, solution is usually face the flanges flat ,countersink the thread for the pipe and make sure the pipe is below the mating surfaces, very often over a 100 years of life the flanges are past it ,and owners get new flanges cast for me to machine over the winter break, and then assemble with thin gaskets.

Thread: Center drills
09/04/2020 11:08:54

if you are model making also consider the appearance of the finished job,for example a crankshaft with centre holes in each end,full size cranks had centre holes,so a model should have the same and should if possible be in proportion ,ok you could after finishing the crank face off a bit of the end to reduce the diameter of the tapered hole, though the short length of parallel hole formed by the front of the centre drill can then look too large.Also when using the smallest centre drills ,the parallel point can seize up when lubricating with soluble oil,to save the drill point breaking its best to use a better lubricant,just a drop of the fluid type ROCOL works well.Theres no cutting rake on these drills so withdraw the drill a couple of times to clear the swarf and relubricate. Also if the centre drill is frequently used for centering prior to drilling,the drill point gets blunt,so it gets resharpened and can be sharpened a number of times without problem,but do not use drills like this on jobs where the centre hole is to be used with a centre,as the point of the centre can bottom in the shallow parallel hole and not engage with the tapered hole.

Thread: What is it with the fit of old slotted screws?!
07/04/2020 11:48:47

Apprenticeship as an instrument maker,we were expected to buy via our companies tool club all our tools,all the screws we used were even number BA and and our Screwdrivers with plastic handles were made by STEAD ,and they made a set of 5 screwdrivers to suit 0 to 8 BA screws. Sixty years later I still have them,very good crewdrivers. A cheap way of getting screwdrivers which can be butchered is go round a boot sale or auto jumble and look in the odds and end boxes, you can find old english made screwdrivers,they may be bent a bit or the blade chipped but can be restored,ignore the foreighn ones most are rubbish, Younger readers may wonder what a tool club was ,on pay day you could pay into a tool club run by the company,when the funds accumulated you could place an order for a tool and the company would get them for you at a discount, eg Gordon spanners were around 50% ff list price. Some firms just aranged at discount scheme where you just went along and bought them direct at discount,The longest save of 5 bob a week was for my Moore and Wright toolmakers cabinet which was 146 shillings, its still written on the back of the cabinet in pencil. Its sad to think that the firms who made these fine tools have disappeared or the name has been bought up but not really the same company. Best bit of luck I had was after 9 years of work and two jobs, I got a job with a multi national co,on joining I was informed that I would not need to bring my tools as all tools ,cabinets ,overalls etc were supplied ,plus the toolroom was absolutely brand new. So I had all my tools at home ,to allow me to start serious model making,wages were good and I bought a new Ml7 and new trials bike within a year and have never looked back.

Thread: What are you doing to stay safe
27/03/2020 19:46:06

I live out in rural Hampshire,nearest neighbour is 250 feet away,so no local contact problem,biggest risk is shopping once a week at Sainsburys,though today they were a bit more sensible,NHS people went in first,wrinklies including me half an hour later,though we had to queue in the car park spaced 6 ft 6 inches appart and it was freezing cold,did not see any evidence of cleaning trolley handles or anything else.it was busy but not packed out like last week.doctors and local bakery were taking adequate precautions,I can get going out down to two days a week.my wife had replacement knee op on 9th mar ,she got to physio last Tues and that was the hospitals last day of physio,they will contact her for at least the next three weeks by phone,to check on her progress,so at least she does not have to go out for some time.Its a case of keeping ones head down,and hoping. No boredom ,helping my wife,gardening ,well mowing a lot of grass and other domestic jobs keep me busy,cant get on with any engine restoration work,

Thread: Face turning Bronze castings - strange surface finish
27/03/2020 19:17:40

Why waste your cash on carbide inserts,HSS correctly ground as I said earlier can give very good finishes and at a very low cost ,its choosing the right tool for the right job, and most hobby work only needs HSS though it does require a degree of skill .

Thread: Keeping busy
25/03/2020 10:45:11

Live out in the sticks,started mowing the lawns,grass growing like mad,kept busy as my wife is recovering from a knee replacement,took her for physio yeaterday,from today physio closed for at least three weeks, dreading weelkly shop on friday, last week i queued for 40 mins to get to the till.Watched all those idiots on the tele totally ignoring the curfew,thick as two short planks. got plenty to do in workshop with restoring stationary engines,therestored Stuart 600 needs mounting on a trolley,then theres a Ruston Hornsby and a Robinson hot air engine to restore. Rally season hit hard no shows until at least July,all my regular shows are cancelled,Got some weed killing to do as they are starting to grow,lot easier to grow weeds than veg, Then theres further improvement to my security as towrags thieved 140 gallons of heating oil from my tank. I am fully occupied I do know how the majority keep moaning that they are bored,all they seem to know is hitting a keyboard.

Thread: Coronavirus
24/03/2020 13:03:53

took my wife 20 miles to hospital for physio following a knee replacement,we were lucky phyisio dept closing from tomorrow for at least 3 weeks , Driving was just like it was 40/50 years ago ,beautiful sunny spring day ,and minimum traffic.

Thread: Record no 1 vice jaws seized - removal?
23/03/2020 22:37:18

Plus gas is a very penetrating oil,the cheapest is diesel fuel,it always seems to find its way out of steel fuel cans via the joints. I use an impact driver for tight screws,though the short vice driver sounds a good idea must work in a similar way to the special tool for removing the screws in automotive dynamos,I am pretty certain that the screws are Whit thread,if csk whit screws are not available try using UNC they are same pitch as whit except for 1/2 inch and 5 degree difference on the thread angle will not matter on a vice jaw screw,if the screw slot,a 1mm or 1.5 mm cutting disc in an angle grinder can be used to cut a deeper slot it will of course put a cut in the vice jaw but a narrow slot will not matter.

Thread: A sight for sore eyes
21/03/2020 16:07:58

when doing a proper selfbuild bungalow,we had 3 ton of cement delivered, one saturday ,driver was bolshie and wanted help,i had hurt my back and was dealing with another delivery,so my wife said she would help unload,lorry driver "you cant do that,"wife "try me" one cwt bags in those days and she kept pace with the driver who afterwards said he had never seen a woman carry cement bags,And later on after the 1987 storm my wife went up on the roof to replace those big redland stonewold tiles,I have to admit that I s--t myself up a ladder.When we tiled the bungalow we carried the tiles up in a chain gang ,friends up the roof me on the middle scaffolding and wife and mother in law at the bottom.

Thread: Colchester student 1800 carriage handwheel issues?
20/03/2020 10:05:49

Just had the top slide index ring slipping on my master ,the friction device is three balls and three compression springs,these had lost their spring due to a build up of old soluble oil and dirt,the saddle handwheel detent may just be stuck with dirt.

Thread: Face turning Bronze castings - strange surface finish
18/03/2020 19:33:21

I would rough with carbide as the skin of the casting wil be abrasive ,then finish the last ten thou with two cuts with HSS tooling ,the rings look like the product of a tool with insufficient clearance,or the side clearance has been worn away. Brass and bronze cut far better if the tool is ground on a fine grit wheel and then stoned to give a clean cutting edge, the biggest mistake made is to stone the tool too hard and to let the stone roll in your fingers so that the cutting clearance is lost. Back lash in screws rarely affects finish as the tool is being pushed,too much is made of baclklash,belts and single phase motors causing finish defects,the problem is lack of experience in grinding tool and too high a speed wearing the tool.

Thread: Acetal or phosphur bronze
17/03/2020 14:13:51

Leaded bronze is better than phosphor bronze and easier to macine

Thread: 15,000 for a Bridgeport!
15/03/2020 16:58:32

just looked at a Stuart No 1 in the sale catague top estimate £500 ,set of raw castings plus material from stuarts is £600 what do you make of that.

15/03/2020 16:48:38

Another thing to watch out for is VAT, on private sales at an auction vat is only due on the auctioneers commission,at auctions of a commercial nature,say for instance a factory sale,where all the machine tools and other items where vat claimed in the past,vat at 20% is due on both the bid price and the commission price,can be expensive. cash private sale can still be the best deal.Read the small print in the catalogue before bidding. a buyers premium of 25 to 30 % is pure greed by the auctioneers.

Thread: Holding End Mill on small lathe
15/03/2020 10:25:49

nothing wrong with milling in the lathe,I did a lot of the milling on a 11/2 inch Allchin with a M7 and held the cutters in a 4 inch 3 jaw, admittedly the lathe was new (1968) ,never had a cutter move ,though I do not think it would be so succesful with an old chuck with wonky jaws. I cannot see the point of the suggestion to use a parallel shank ER collet chuck held in a three jaw,a parallel shank cutter is the same as a parellel chuck with the additional problem of it placing the cutter a lot further from the lathe spindle bearing, the use of a 1 mt collet would give the advantage of the cutter being very close to the end of the lathe spindle. As others have mentioned never use a Jacobs chuck to hold a milling cutter a mill with a sideways load, though its ok to hold a milling cutter in a jacobs chuck in the tailstock to make counterbores,ie an end on load. For milling in the lathe where a surface needs a flat face its cheaper to use a fly cutter, with HSS toolbit , easy to sharpen,and can be mounted in a block bolted to a face plate.

Thread: Vaccum for a milling machine.
12/03/2020 16:09:27

Vac cleaners are ok,for small metal chips but do not work with the longer curly stuff.,can be pain to get the curly stuff out of the flexible tube Do not use a vacuum to suck hot steel direct off the cutter ,especially using carbide tooling without lubricant,it will soon cause a fire in the cleaner.I generally clean up cold swarf with a old steel dustpan and brush,then use a cheap paint brush to clean the nooks and crannies,then a Tslot cleaner cut from sheet steel, plus a narrow vac hose to clear out the bottom of the T slots.

Thread: Myford ML10 Lathe Chuck
12/03/2020 15:11:51

I have a 16mm keyless chuck,3mt used on a Colchester easy and quick to use ,snags are it does not grip smaller than 3 mm drills and when used for holding taps its ok for tapping go into reverse to get the tap out the hole and the chuck looses its grip, All my other chucks are genuine Jacobs ,and they are reliable, the 0 to 1/2 inch Jacobs on my Fobco and S7 are just over 50 years old and still in excellent order.Nowadays I use ER collets for tapping,

Thread: I Hate Brass!
07/03/2020 09:17:37

Spent my training on centre lathe turning brass for days on end,I like machining it,chips can be deflected by inserting a bent piece of shim under the front toolholder screw. On a capstan lathe all our brass turning was carried out with full flow soluble oil,this lubricated and cooled the tooling plus stopped the swarf flying.

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