Member postings for Mike Poole

Are ceramic slips a different size from steel ones as no oil film need be present? Just giving the pot a stir!

Mike

Overhead camshafts were tried by the works but gave no power advantage,the standard valve gear on the Trident wears out at a an alarming speed, modern replacments improve things a bit. With the size of the valves on the trident there is not much space to put a central plug but it has been done many times but I suspect one of the smaller format plugs are used.

Mike

I think backpacks are an issue, I do not remember which show it was but a backpacker came close to stabbing me in the eye, luckily a jab in the cheek from something sharp just below my eye was the only damage. A bag and coat check in would be welcome I am sure. I remember a doctor on TV once saying it would be nice if his patients took a shower before visiting him, the same goes for some show visitors.

Mike

Many things built by model engineers are full size, many petrol engines and hot air engines are not scale copies of anything.Mike

It would appear that many people on this forum are interested in bikes, topics that do not interest me I do not read but given the habit of threads to wander I usually read most.

Mike

Milton Keynes metals do 10BA steel studding, £66 per meter though.

Mike

I liked Guy Lautards story of the man who wanted to learn the secret of making the finest rifle barrels. The gunsmith after much persuasion agreed to take him as an apprentice. After months of working the old man had not disclosed the secret. The old man was taken ill and an urgent job came in and the apprentice decided to finish the job, the old man returned in time to check the job, after testing he stamped his name on it. The secret seemed to be to strive for perfection using the methods that were well known but applied with the utmost care and precision.

Most of us use the same equipment, so the precision of the finished items must be down to the care with which we use the tools. The techniques for using equipment from a file to a lathe are well documented but to become skilled in their application practice is required. However it has been my experience that even when I think I have mastered a skill there will always be someone better. Usain Bolt seems pretty quick on his feet but I suspect it won't last forever.

Mike

Chris Vines book on painting models describes the techniques he uses, but the message I got was that much more effort is required than many of us might be willing to apply, he certainly does not shake a rattle can and spray a finished job.

Edited By Michael Poole on 12/10/2014 22:17:49

I think you can believe the label and you do have a Perfecto lathe, this is a plain or training version which would not be fitted with leadscrew and change wheels.The lever behind the chuck is to operate the back gear which will give a set of low range speeds, you will also need to disengage the pulley so it free runs on the headstock shaft, this is often just a screw to release the 3 step pulley from direct drive to the shaft. To fit all the parts to give screw cutting and feeds will be a lot of work and expense. An idea of the parts required can be got from viewing the pictures on the Lathes website machine tool archive.

Mike

Triples seem to be quite smooth, my T150V was much calmer than my mates Bonnie. My Hinkley Trident has balancer shafts and has a slight left right rock when idling at lights etc. the T150V did not seem to do this as I recall. I had a 250 desmo for the weekend once and the vibration was fierce, the other thing that made that bike hard work was the rh reverse pattern gear change, I had mastered swapping from left to right but the reverse pattern threw me completly so I almost came to a stop before I had decided which foot and which way to change, glad to give that back to my mate.

Mike

Michael, that is a long list! I am surprised at the small capacity of some of them.

Mike

Michael, you have forgotten the Moto Guzzi, 90° but transverse.

If I had a spare Trident lump is would have to go in a Rob North rolling chassis, would need deep pockets to see that happen though, when I ran my T150V it kept me poor and Norman Hyde rich, I used to be very good at supporting pub landlords and Triumph parts suppliers. My Hinkley Trident just needs petrol, chains and tyres.

Mike

Edited By Michael Poole on 08/10/2014 19:19:49

The triple has a lot going for it as a bike engine, the sound of a works Trident or Rocket III has to be one of the best sounds ever from the 60/70s.

Mike

Hesketh built a V twin for a while, not in huge numbers though.

Mike

If the roll pin is definitely an original fitment I would be surprised if it was intended to shear, as previously mentioned a hardened roll pin can make a mess when it shears. As it has sheared I think I would replace with a soft material and if nuisance shearing occurs work up to tougher materials or larger size. Some shear pins are steel but waisted so a weak point is defined. The waisted section can be increased in diameter until nuisance breakage does not occur but it is still the weak point that we want to break first.

Mike

It will have a ground finish and be accurately sized, usually 13" long as purchased but longer lengths available. If it hardens after heating to cherry red and quenching and has the accurate ground finish it's a good chance it is silver steel.

Mike

I am also a fan of Trefolex, used it on conduit threads when I was an apprentice, thought it smelt better than tallow which was also popular. I have used it ever since for tapping, also on a hacksaw blade but can be messy.

Mike

To cut steel and wood on the same bandsaw you wil need around a 10:1 reduction, this is not really a suitable reduction for an electrical solution if you would like some power to cut with. A mechanical solution will be the most satisfactory, either a gear redution unit or a two stage belt and pulley setup.

Mike

It always makes me smile when looking at the build quality of military equipment. It has to be reliable in battlefield conditions but also has to be 'squaddie proof'

Mike

Hi Ian,

i can't tell now but 0ba is not a popular thread in my experience, I think BA was popular below 1/4" but I think a1/4" thread would be used rather than 0BA in cast iron Myford seem to like BSF even in cast iron whereas Whitworth was commonly used in cast iron as a coarse thread was recommended to avoid the possibility of the peaks of finer threads breaking up.

Mike

Hi Michael,

My 7R has the same threads on the cross slide as you describe. The threads on the back of the bed for attaching accessories are 6mm, i could not get a 1/4 BSF screw to start and ran a 1/4BSF tap through, it took a bit more out than I was expecting, the pitch of 6mm and 1/4BSF are very close so I think no harm done and did the same for all the holes on the pad. They would have best been left as 6mm as BSF are not so readily available as metric. The Allen bolts holding the headstock to the bed are also metric. The Allen screws holding the apron to the carriage are also metric (M6). I expect Myford changed some of the bought in fastners to metric as supply became more difficult and expensive. After nearly 50 years of metrication BSF seems close to dead and only specialist suppliers to the classic vehicle market supply at a price.

Mike

Edited By Michael Poole on 10/09/2014 16:39:04

Edited By Michael Poole on 10/09/2014 16:49:07