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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: Milling machine in the (wood floored) workshop
04/07/2021 09:39:39

Why not just thicken the whole floor,this would allow future repositioning of the machines. Suggest thicken the whole floor with four sheets of 18mm shutterring ply which is the cheapest ply and thenput down on top four sheets of a better quality 18mm ply to provide a better surface . Dont worry too much about the machines weight 350 kg is nothing in terms of machine tools and easily moved with a crowbar,at one time I had a S7 in an upstairs bedroom,16 inch pitch joist with 20mm t and g floor boards ,no problems with stability or accuracy.

Thread: Strimmer /BrushCutter any recommendations ?
03/07/2021 10:20:56

I use a Ariens wheeled strimmer/brush cutter with 6 hp 4 stroke engine,push it on big wheels like a lawn mower,as an ordinary strimmer sods my back, now even a machine like this will not cut thick brambles,brambles it destroys the thickest cords. a heavy commercial brush cutter with a harness which with a steel blade will cut up to 30mm stems needs a strong operator,we once borrowed a Husquavarna which really attacked rough scrub with a steel blade.Using a ride on mower on brambles will wreck it. Starting and carb problems with modern petrol is a nightmare,modern carbs have little or no adjustment due to the green emmisions lobby, Some chainsaw users fit carbs from old scrap chainsaws onto new machines as they run better and start easier. My last new Stihl chainsaw ,was a pig to start and now I have got to old to pull on the cord so gave it away and bought a Stihl battery chainsaw,expensive but is instant start and reliable and will cut a 7 inch oak log. A friend who repairs contractors and domestic garden machinery despairs at the way operators just beat their machines to death, latest comment from him was an upmarket mower with cast rollers came in with a smashed roller on asking him how on hell did that get broken ,reply from contractors operator " did not have a ramp so pushed it off the back of the truck"

Thread: Is buying a custom ground tool my only option??
01/07/2021 09:54:12

To form accurate circular grooves I have made an adaptor for the lathe tool post which holds milling cutters ,the type which were used on horizontal mill arbours with a one inch bore,these were available with full form internal and external forms ,good used ones can be found at s/h tool dealers or auto jumbles ,usually very cheap as there is little demand .

Thread: dirty clutch trick
01/07/2021 09:11:49

The 42 inch deck drive on my mower is a tight /slack belt clutch, the belt, which recently broke after 16 years. there was no real wear on the pulleys and thats with a 17 hp Kawazaki ,who would have thought that when I was a youngster that lawn mowers in the future would have 17 hp v twins. regarding the myford clutch my S7 clutch has been ok for near 50 years with the original drive belts.

Thread: Aircraft General Discussion
25/06/2021 14:00:07

Myself and a friend were in Petersfield Hampshire on this last wednesday, we heard a hell of a roar from a fairly low flying aircraft and along came a VC10, fuselage was painted but could not make out any detail as it almost directly overhead, a quick Google indicated that the last one had flown several years ago,but an airworthy VC10 was possibly up for sale last year.It was so nice to see and hear one of these aircraft again, We are not that far from Lasham airodrome so does anyone know if is based there,or going for maintenance as they used to maintain them there a long time ago.

Thread: Moving machines
21/06/2021 10:03:55

Always try to lift machine tools from the top with an engine crane,lifting from below ie with pallet truck or lifting table can be dangerous ,just too top heavy, use a strop for lifting,new ones are not expensive ,a lot cheaper than a damaged machine,rope can be used for smaller machines as long as its new and not old ,dirty and oily and you know how to tie knots.for horizontal movement I prefer steel rollers anything from 5/8 dia solid to inch bore water pipe,scaffold tube at 1 7/8 od is a bit too big ,if the load slips off this tube on one corner the load can tilt a bit too much for comfort ,if it slips off small rod it cannot drop too far,though the floor has too be smooth.Engine cranes can also be used to dismantle/assemble machine tools,that cannot be done with a pallet truck.

Thread: Dividing head - Beval gear ?
20/06/2021 10:23:50

Spiral milling is also useful for cutting spiral oil grooves in bearings and shafts when restoring vintage parts.The sets of gears for spiral milling were established in the late 1800s so the tables for the set up are in imperial units to suit mills with imperial leadscrews,on my mill with metric leadscrew I made and used 100 and 127 wheels in the gear train, making the 127 wheel was carried out using differential indexing,the part of this set that requires care is to determine if the index plate moves slower or faster than the worm spindle,

Thread: Identifying Senior Milling Machine
17/06/2021 12:46:27

Please remember that horizontal milling machines are regarded as very dangerous,and always have been .For very many years well before Health and safety became a pain in the backside, power presses , grinding machines and horizontal milling machines were subject to the factory acts,and even companies that turned a blind eye to safety always made sure horizontal mills had their guards in place. There was no safety concerns with vertical milling machines,when a Factory inspector came round to a factory he expected to see guards on drilling machine chucks but never made any comment on vertical mills.If a roller type milling cutter is working and an operator catches his fingers in the cutter it does not let go and will result in serious injury, If you do use it in a school environment I would suggest that the horizontal arbour and the cast arbour support are locked away and not used,just use the vertical attachment. Unlike nowadays when people see a risk if you sharpen a pencil with a knife,machines and processes listed on the Factory Acts were there because there were very many real accidents not risks. One of the very early mandatory guards in the early 1900s was that back gears had to be guarded to stop lots of operators loosing their fingers in the gears.

Thread: What lathe pointers
14/06/2021 19:59:16

Cannot beat a Colchester Master 2500 long bed, ( Imperial) reversing clutch to make metric threading easy,1 .630 inch spindle bore ,carriage handwheel to the right hand end ,to avoid hot swarf on your hands,full threading /screwcutting g/box, g/box includes DP worm cutting. Easy to use. d1-4 spindle, though I do miss the 2 inch spindle bore of the now departed Colchester Triumph. I dont worry about weight you can move anything on rollers and a crowbar.

Thread: Mancave insulation
11/06/2021 18:58:49

We have a proffesionally built timber stable block,weatherboard externally, over breathable membrane,one unit is only covered internally up to 4 ft high with plywood ,the remainder is not covered and the membrane is exposed,this membrane has fell apart and reallyuntidy, Our bungalow roof was old style felt and batten under the tiles,severe storm damage involved the whole roof covering and battens being replaced the new covering is black permeable membrane which is supposed to repel water, which it did not and the loft is noticeably colder. My workshop is 120 year old second hand timber tongue and groove externally over a layer of building quality polythene,the 2inch cavity is filled with fibre glass loft insulation.inside is a further layer of tongue and groove. Now every building guide states that membranes must be permeable,well on my workshop the pothene works well (14 ft sq) is warm ,dry,no rot or fungus on the timber,been there for 35 years and and still in good condition

Thread: Scalped on my doorstep - it left an unpleasant taste in my mouth.
06/06/2021 09:53:19

I think foreign aid should cease,I wonder how many new Mercedes cars have been bought with our money,Charity should begin at home,looking out for the homeless and other genuine needy people in this country,if we had a national disaster no one would help the UK.Government and other regional officials are only distributors of our tax money,its not their money so they do not know the value of money,or the over inflated prices for goods that they buy,and they never get the sack,just a sideways move for bad decisions,Look at HS2 ,many times over original estimates as per usual with civil engineering,prime ministers who make the decisions come and go,they will never feel the pain of financial loss,they get more grief for telling porkies in parliament than wasting possibly 200 million £ on a railway line,which may never be used ,I see HS2 like Concorde,only affordable to the rich.and next to useless.

Thread: Ward Capstan Lathes
30/05/2021 09:40:59

as part of my apprenticeship I spent a few months on a Ward 2a as a setter operator,making batches of parts from 20 to 2000, they were heavy ,well built and never gave much trouble,though a machine which had made vast batches on piecework no doubt took a hammering.when I worked at home there were times that I wished I had a capstan to knock off relatively small numbers of parts,where a lot of drilling and threading was required,Not all capstans were collets only,there are lots of photos in the tech books of the era showing two and three jaw chucks,thread cutting chasing attachments driven by leadscrew attachments,most of the info refers to Herbert capstan lathes,the threading attachment used a number of interchangeable short leadscrews , plus a drive shaft which had a selection of gear ratios.Would it be worth getting a Ward, unless it was free with a lot of equipent and space is no problem I doubt it.I once visited a chap who made lots of parts for the vintage restoration trade,he had at least 3 Ward Capstans,which he aquired very reasonably, he used each one for just one material, so that he could keep the swarf clean and get top price for the swarf. It may not occurr to the modern generation ,in the old days of very tight costing the value of the swarf or sheet material left after pressing was the profit from the job.

Thread: Carriage stop/dial gauge mount.
26/05/2021 19:10:11

dial gauges do not like soluble and other oils and the holder is usaually in direct llne with the chuck.Ok if only used wth dry cutting materials eg brass.A micrometer stop is better.

Thread: Boring head finish
22/05/2021 12:40:40

Been thinking why would you get an 8 thou tapered bore in cast iron over the short length of cylinder,the lathe would have to be horribly worn to turn that taper,the obvious is use of the topslide rather than the bed,though Nick states that he got a better finish when using the the power feed so one has to assume that the saddle is being used. For boring an iron casting I would use carbide for roughing and hss for finishing , I find carbide inserts tend to push the metal off rather than cut it, If using carbide for the whole job then use a new insert for the finish cuts,small iron castings can have hard spots which can chip carbide inserts on roughing cuts.so if the lathe bed is in good condition then something must be moving, ie the tool insert in the boring bar,the boring bar in the holder ,the tool holder moving ,the top slide not fully clamped, to stop rotation ,the cross slide moving away from the cut due to any vibration,Make sure the tool is on centre or a few thou above centre,boring tools below centre will cause problems ie rubbing & not cutting cleanly and not too obvious to the beginner. Good practice is to use power feeds though a good turner very often finds it quicker to feed by hand over short lengths, for the novice feeding by hand allows one to get a "feel" for how the tool is cutting,if it appears to be hard work feeding the tool then check the cutting edge and cutting rakes and clearances,also honing tools, L have seen novices hone the tool too hard and remove the cutting clearance. My first turning at work was on a Lorch plain lathe,that taught you how turn the slide handles smoothly at a constant feed and get a good finish,and keep the toolbits sharp.

Thread: Water soluble coolant
20/05/2021 11:40:22

Soluble oils have always left staining under vices .rotary tables etc,rusting caused by soluble oil is a more recent occurance in the last 30 years ago, no due to legislation the some additives have been removed and bacteria growth is now more common this tends to eat the oil and make the water acidic causing corrosion,Castrol suggested using disenfectant ,I tried jeyes fluid but did not work,and also aereate the fluid often as the bacteria seems to grow when the machine is not in use. Changing the fluid more frequently seems to be one option. Back in the late1980s where I worked four cnc machine suffered from bacteria growth,theses were running 24/7 yet the high performance solubles oil had bacteria growth ,as the project only lasted 6 months we lived with it.On an automated machining cell,where stoppages had to be kept to a minimum, the problem was resolved by using a very expensive neat oil,initially developed by Boeing for high speed routing of aircraft components. the oil was applied as an air blasted mist. Soluble oil no doubt had to be changed many years ago as in my youth there were lots of cases of dermatits ,particularly when working on capstan lathes,and the soluble also rotted your shoes and boots until someone found that the old TUF shoes of the 1960s stood up to the oil, but for machining and long life it was far better.

Thread: Pillar drill motor size?
18/05/2021 11:02:01

I/2 hp single phase seems to be the standard for half inch capacity pillar drills ,with a standard low spindle speed of around 500 rpm, As your machine has back gear and your using the back gear low speed range,I would try the 1/3 hp motor. Set the belt a little slack as if you stall a s/phase motor it will burn out very quickly as I once found out.

Thread: Machining castings in the 4-jaw - knocking?
17/05/2021 19:13:14

Agree with most comments, I would use a faceplate,cutting speeds of 80 ft per minute for HSS and 3 times faster for brazed carbide rough across the surface with brazed carbide, then finish off with HSS ,the tool tip needs a small radius to improve finish,if roughing is carried out with HSS then regrind the tool before finishing,when roughing do not bother to hone the HSS tool, When clamping a small casting to a faceplate,start by checking to see if the cast face which beds against the faceplate is flat and does not rock, use a file to remove any high spots sometimes shim is suggested buts its not so easy to hold the casting ,and clamp it at the same time, and bits of shim flying round can cause nasty cuts to your fingers.then when the second face needs machining check again to see if the casting rocks on the faceplate as it may have slightly distorted due to internal stresses being relieved,if the surface is not flat then with a casting the size of the engine boxbed lay a sheet of emery paper on a flat surface and rub it around until the surface is flat hen clamp it to the face plate,It is best to machine the lower surface of a boxbed first. At work one job that used to regularly occurr was the cast bed for a travelling microscope about a foot long ,8 inches wide and about 2 ins high, it went through a similar process,only 3 bolted to a 28 inch faceplate,100 castings total, its surprising how castings do move after machining even after being in store for some time,we used to have to file the base flat to a surface plate before the top working surface was machined,That job was full of interrupted cuts .

Thread: Turning Cartwheels
16/05/2021 17:21:16

I once had a 10hp Hornsby oil engine on this type of wheel and as I found they are very heavy and probably expensive to make at the time.Though no doubt they needed to be strong as many were exported and expected to stand up to hard colonial use . I assume your farm boy engine is a US style hit and miss engine ,the usual wheel for these had round steel spokes riveted at the rim,how they fitted in the hub I do not know ,never seen a broken one or been asked to repair one. though some people regard these engines as cheap and rough, the more popular ones eg Amanco (associated) were made in vast numbers at really competative prices and are the result of first class low cost production engineering so I doubt if the spokes were threaded in ,more likely just a tight fit and held in place by the rim.

Thread: Tribological query re shafts and bushings!
16/05/2021 08:50:17

Silver steel for the pins,mill the ends square. use leaded bronze for the bushes (do not use phosphor bronze) or try Oilite bushes if they list the size required. I would never consider steel on steel for bearings,which are only lubricated by oil can.

Thread: Lathe Motor running Lumpy :-)
15/05/2021 16:52:33

Looked up Chester spec,its expecting a lot to drive a 6 inch c/h lathe,with a speed range of 60 to 1800 rpm wiith a 1.5 kw (2hp motor) If a new motor is required I would think 3 hp 3 phase is a minimum, Older lathes of this type used to have smaller motors as they had a lot lower top speeds its the 1800 rpm that kills a 1.5 hp motor plus the extra load when the feed shaft is engaged. Though I dont know why the motor is lumpy I would have expected a total failure,I have owned 3 Colchester students /masters (similar size) of early and late types and as spindle speeds increased over the years ,so motor HP has increased.

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