Here is a list of all the postings robjon44 has made in our forums. Click on a thread name to jump to the thread.
|Thread: tipped tooling|
Hi all, with regard to brazed tip Tungsten Carbide & butt welded HSS tools, they were never intended to be used as supplied, at the end of the production line in both cases I believe there was a man who picked up each one & showed it a grinder & said "this is a grinder, you may need to become acquainted with it at some point", indeed if I had a pound for every one that I ground for myself or other people I could have retired at the age of 25! So, if you can't grind them yourself or find someone to do it for you then put them aside, you will get far better results using small section HSS bits in home made holders with a bench grinder with half way decent tool rests as advocated by Mr Harold Hall etc,or indeed the Diamond Toolholder advertised on this very page! PS do not insult this cutting media by tip toeing about, it is capable of cutting at the read heat of steel so remember its called roughing out for a reason!
Cheers Bob H.
|Thread: Nalon Viper|
Hi Ramon, it is recognised that anyone can become increasingly sensitised to cast iron dust, in times gone by a condition called Turners Lung was recognised by doctors, I have only ever known one person in a lifetime as a turner who had it whilst working manual lathes machining shedloads of CI dry & he said he was coughing up rust !, however he eventually got a job with a reputable company with a more enlightened view of H&S more creative filtration etc. In more modern times on CNC lathes the size of Transit vans we always machined it under high pressure coolant without problems.
I suggest as a solution acquiring or making one of those belt packs worn by welders which supply filtered air into their helmets which protect them from the noxious products of their welding activities, all of my mates who were welders swore by (not at) them.
|Thread: Knurling tool operation|
Hi all, indeed the cut knurling tools on Mr Cutwells site are indeed works of art ( or tool pornography ), the secret being that the shafts that the knurls attached to are geared together at the other end inside the head of the unit to prevent mismatches of the pattern. Used them a lot on CNC lathes, to make them cut of course the wheels have a substantial angle into the front face, probably 10 degrees or more which produces a stream of fine chippings & gives an excellent form & finish on the product meant to be seen, clutch alignment tools for BMW motorcycles as an example, in shedloads. The single wheel ones are for straight knurling & work in exactly the same way, I have an example in front of me, a wheelstud & the knurl on it to be pressed into a wheelhub has a mirror finish, again made in thousands. However I did test that one out on a manual lathe out of curiosity & it performed flawlessly, therefore if you could acquire such a wheel or modify an ordinary hardened steel one on a T&C grinder? Finally I have in my Private Collection a 3 wheel version of this type of cut knurler that can definitely be used on a manual machine, it features 3 longitudinal arms with knurls on the ends & knurled ring on the body to wind in or out to the required size, so skim a bar end to size, establish knurl size then let it rip on the job in hand, I've been castigated many times on here for using industrial sized tooling, however in my working lifetime there have been many opportunities to acquire such items at little or no cost which in a home workshop environment would likely last forever
|Thread: Record 25 vice handle|
Hi all, then just for the icing on the cake you could fit a suitably fat O ring at each end, under the head, to forestall that eye watering moment whilst in a rush, when the handle slides down from a near vertical position & traps the web between your thumb & first finger creating a torrent of Industrial Language, just a thought.
Cheers, Bob H
|Thread: Scam alert|
Hi all, phone rang this morning, picked up without speaking & was informed that it was a recorded message with regard to a payment soon to be taken from my Amazon Prime account & would I like to press some number keys for more information, alarm bells began to ring not least because I don't have such an account! However, knowing the sophisticated technology these a holes have at their disposal, such as making a cut & paste of anything you say to make it appear that you did verbally authorise the payment I cancelled the call followed by checking that I indeed was not the proud owner of such an account, paranoid I know, but the reason I posted it on here was that there may be those who use our forums who may not know the lengths these creeps use to steal from them.
|Thread: Cutting stainless steel rod. Bandsaw or chopsaw?|
Hi all, +1 for the stands to convert an angle grinder into a chop saw, the 1st one I acquired, new in box from a car boot sale, was of sheet metal construction & proved more than adequate for the task, the most memorable thing was that when I set about assembling it the instructions began "set the baseplate with 3 chinks at the front" I assumed this to be a private joke by whomever translated the sheet, I muddled through as I didn't have time to rope in some guys from my takeaway of choice to help as they always seem so busy, anyway some time later another one showed up, you guessed it £4 at the car boot sale brand new, made in Germany, with a heavy cast iron base & chromed parts, even more marvellous than the original one, which I donated to a local "Men's Shed". The 1mm slitting discs certainly do a good job & are readily obtainable from Toolstation & the like, or if you are as tight as me, from the discount supermarkets & have proved just as durable.
Cheers, Bob H.
|Thread: The wonderful world of gauge blocks|
Hi all, just as an aside for those who don't like to touch down on gauge blocks, perhaps I should have mentioned gauging the approach to 'touch down' by that most legendary of really thin things, a cigarette paper.
Ps my good set of slip gauges are tungsten carbide.
Hi all, some 60 years ago during my turning apprenticeship I took my turn through the toolroom working on a shaping machine of truly Victorian style! All of the turners, millers & shaping machine operators had a box of out of calibration gauge blocks & I still have & use mine to this day. A quick check reveals 1 off 3" 20 off 0.2" - 0.95" 50 off 0.05"-0.2" despite having a hard life over all these years a quick random check with a Mitutoyo 0-1" micrometer could not reveal any error as great as 1 tenth of a thou! On a shaper (I have an Acorntools 7" if machining a surface with shoulders steps & troughs they are very handy even if it becomes necessary to alter the angle of the tool itself to reestablish tool height with a gentle touch on the appropriate block, I have a shaper gauge which came with the machine.
Another useful adjunct (is that a word?) is a 2" length off HSS ground with a chisel edge to stand on block(s) if you still mark out workpieces, ie mark out, clamp in vice, machine down to line, jobs a good un'. It is not necessary to do any of these tasks to a tenth of a thou but more to save that most precious commodity of all, time.
|Thread: Those little screws for carbide inserts...|
Hi all, with regard to losing the lovely little screws securing tips in place, they are only there to stop the tip falling out if you remove the toolholder or index the turret, a well known PIA with tools with 2 inserts facing in opposite directions such as U-Drills, I always used to magnetise my Torx screwdrivers, however as dropping a titchy little screw onto a swarf conveyer at night is best avoided due to the industrial language it propogates my preferred solution was aquire one of those small buckets used by lovers of bonsai trees or windowsill gardening, around a couple of inches across hang it on the offending toolholder, problem solved, although if you are as tight as I am you can fashion one from a small baked bean tin (other vegetables are available)
|Thread: Shell Petrol Can Puzzle|
Hi all, back in my early motorcycling days I had a number of 2 stroke machines, 250cc Excelsior Talisman Twin anyone? In those far off days mixing petroil was a bit of a minefield, one of the worst culprits was the forecourt mixing pumps, set mix ratio then hand pump the required quantity into your tank, simples, except when some lazy person omits to fill the 2 stroke oil tank inside it! followed by a continuous cavalcade of bikes & scooters being taken to repair shops seized solid. Having been warned of this disaster by a friend who was a motorcycle mechanic I resolved to take matters into my own hands, run fuel down to reserve setting, add measured amount of oil & measured amount of petrol, agitate bike to give fuel a good swish round, keep a small graduated bottle of oil for everyday use on the bike, bigger one for longer range expeditions, bit of a faff but never ever got caught out. All made a nonsense by nancy boy modern machines with separate 2 stroke oil tanks & variable ratio pumps Bah Humbug.
Hi Andrew, Bob here, let me add my encouragement to that already expressed, as for the views that caused offence well duckies all the fine work done rebuilding full size vehicles & machinery in the world does not get done on machines that would fit in my cutlery drawer now does it? To give an example, a long while ago I had the opportunity to purchase a Meddings geared head floor standing drilling machine from my employer at the time, as it was a knock down drag out price I snatched his hand off, therefore should I have restricted its use to drilling very small holes for fear of offending someone suffering from "machine envy"? I think not & don't get me started on using full size floating reamer holders, tapping heads, 2 jaw chucks, horses for courses chaps.
My advice would be now that you have seen the tidal wave of support you have received on this thread to straighten up & fly right as you've stated. For myself I thoroughly enjoyed our discussions of every subject under the sun & now my workshop & knee problems are resolved hope to get back on a roll.
|Thread: Old Plastic - of all the stupid injuries|
My own personal favourite in my aeromodelling years was when someone asked me to assist them in starting a 0.8cc diesel engine that was being troublesome, picked some starting settings, turned it over by hand & gave it a quick flick whereupon it spat back & the wooden prop rapped the back of my right index finger, the pain was excruciating & travelled all the way up to my shoulder, I can still feel it in my mind to this day, given that I was well versed in hand started diesel & glo motors up to 35 or 40 size albeit with a finger stall, no nancy boy electric starters in those days matey & if there had been I wouldn't have been able to afford one on a 16 year old apprentices wage, lesson learned.
|Thread: Corrosion or Stale Oil (in joint face)?|
Hi there, again with the soluble oil coolant problems, back in the day our coolant was mixed (automatically) in a large tank to the correct ratio then piped to each section so you didn't have to lug it too far to your machine, so far so good, however at that time it was customary to use Jeyes Fluid as a biocide, not the maidens water it is today I might add, it was often difficult to determine whether a coolant splash or a poke in the eye with a sharp stick was the more painful, throw in people spitting in it, throwing cigarette ends in it & my own favourite washing their hands with it (ugh!). Help is at hand however, due to Cast Steel & Cast Iron denaturing the coolant, when it got too rank we would demand a litre of a modern purpose made biocide, pour it in & run the very large CNC lathe for 24 hours to give it time dissolve any gunk in the pipework & then drag it out with a big sludge gulper, job done. So I would suggest a similar regime would be the way to go in the home workshop, substituting an extremely ratty old wet & dry workshop vac to get the last dregs out after draining off.
Hi there, back in the far off days of my apprenticeship when setting up automatic lathes with multiple tool blocks for form tools I was told to wipe the joint face clean & adorn it with Vaseline, this solved the black staining problem, necessary because most of these machines were running on soluble oil, also endowed their operators with the characteristic smell that identified them as Machine Shop persons, my mother had a few words to say on that subject!
|Thread: What Did You Do Today 2019|
Hi Nigel Graham 2, I'm afraid you will have to be patient with your knee transplant, your body will be wrestling with the after effects of the anesthesia, the antics of the physioterrorists etc, plus periods of not being allowed to drive your car & irrational fear of the damn things falling out on the floor! However fear not, mine were so crippled with osteoarthritis that the grating noises were audible when walking, having now had both replaced with lots of shiny stainless steel & engineering plastic over the last year or so, a complete transformation, signed off by the surgeon a couple of weeks ago. DO NOT try to rush things, I know people who have had to had them replaced again after undertaking major gardening & building projects, silly. On the bright side, ignoring the editors advice I insisted on imperial replacements so that I can walk for miles not kilometres (joke), bottom line? I have just turned 75 & can now run 300 yards along a sand beach & clear low obstacles without falling on my face, little different to struggling to cover the same distance to the corner shop or walk the dog, workshop never tidier & learned the latin names of every weed in the garden. Final tip, do get a pair of quality knee pads the knees do not appreciate hard surfaces at all. Best of luck Bob H
|Thread: Turning Cast Iron question - Health & Cleaning Up|
Hi all, in the distant past when cast iron was always machined dry there was a recognized medical condition called Turners Lung caused by inhaling CI dust & thence coughing up rust, I only ever met one person who had this condition but that is one to many in my opinion. Therefore in modern times it is machined wet on CNC machines & all the crud is despatched into the swarf bin by the conveyer, however this is not the case in a home workshop, all is not lost however when one extracts the offending material using a vacuum cleaner (pause for dramatic effect), no not directly into such a machine with a whopping electric motor involved, but with a plenum chamber of the type used to clean up ashes from wood burning fires & stoves, an empty canister with inlet & outlet & of course a filter, I have used mine for this purpose, also machine clean up during machining, not to mention extracting wood chip & dust from routers, sanders, planers etc which generally have a fitting for the purpose, maintenance has consisted of giving the outside of the filter a quick flick with a soft hand brush & a wipe round the inside with a damp cloth & lets not forget the crud that finds its way into the footwells of the car!
|Thread: DIY Bed Gap|
Hi all, add Astra GTE to list of cars with added drum for handbrake, would stick occasionally if left on for long periods ie on forecourt, I carried a hefty plastic mallet to deliver a clout to the middle of the wheel, only happened twice in 40,000 miles, otherwise car behaved like scalded cat.
|Thread: Sending of heavy items|
Gentlemen, my inbox has never been fuller, my thanks to those who offered constructive advice, on the other hand if I'd realized that the forum had been hijacked by Metric Extremists I would probably have cancelled my subscription! However being older than dirt I am able to work in both systems, singly or simultaneously, in fact it is still necessary when making components to interface between the 2 systems, for those unaware of this fact there is a big country the other side of the Atlantic Ocean that shows little desire to metricate. I spent more years than I care to remember (14) setting & operating 2 CNC bar machines doing just that. On the run up to retirement only a few years ago I campaigned a Colchester Tornado CNC lathe for a firm that couldn't make its mind up which system to work in on any given day, not my expletive problem. Finally, as I benefit from a first class pass in O Level English Language I should point out that only a Metric Onanist would not realise that I really meant to type 15.876 kg.
Gentlemen, do forum members have any advice on costs of dispatching compact but heavy items, for example electric motors or machine vices both come in around two & a half stone & delivery pricing is more than the items are worth. Discuss.
|Thread: Unusual drills|
Hi, I think that what you have there are drills for armour plate, think wear plates on blades of motor graders & similar earthmoving machines, made from Stellite modus operandi under very heavy drilling pressure the drill itself & the material rise to red heat, anneals & then allows the drill to pass through, a classic case of brute force & ignorance! not really the sort of thing you need in a your shed. Naturally I have some that I acquired years ago, around half inch diameter, I would not subject any of my own equipment to that kind of abuse BUT Stellite can be ground with green grit or diamond wheels into lathe or shaper tools that will withstand large amounts of abuse without flinching.
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