Here is a list of all the postings vintage engineer has made in our forums. Click on a thread name to jump to the thread.
I was taught that 1 1/2 times diameter was the maximum thread needed any longer thread wouldn't be any stronger.
|Thread: Cracking a bolt|
Not all bolts are in tension. Sadly the RAF Red Arrows had one of their pilots killed because a bolt had been incorrectly fitted. The fitters had over tightened the bolt that held the parachute and ejection seat together rendering the parachute inoperable. The bolt was supposed to loose in the pivot but no one told the fitters.RAF Crash
|Thread: More evidence that the world has gone mad!|
Ford sold a car in Brazil called a Pinto. Unfortunately it is Portuguese slang for little dick!
|Thread: Long bed lathes affected by the tide|
When they built the Shard in London, they had to take a building down first. They were worried about heave when the building was removed as the ground would rise due to the weight being removed.
|Thread: Brass Tarnishing|
I tried renaissance wax several times and it's crap. Briwax was the best wax I found to stop tarnishing.
|Thread: Aluminium welding|
I have found most of the welding rods are full of silicon and other crap. I normally make my on rods out of the same material as I welding or I just cut up ali sheet into strips.
If you are gas welding ali you need to use American flux as the EU flux has changed and is next to useless.
|Thread: Moore and Wright Micrometer|
I would suspect it's a press fit.
|Thread: Cast iron welding electrodes|
When ever I weld cast iron, I heat up the weld area to a cherry red with a pepper pot burner, then weld it but use a circular action to pool the rod with the base metal. Then reheat the site to cherry red and pack in dry sand. The alternative is to metal stitch the crack cold.
Edited By vintage engineer on 29/10/2019 12:27:00
|Thread: Jacobs model 6414 chuck - removal|
Does this help? **LINK**
|Thread: Mills with tilting heads..?|
Yes it was part of the question in the post!
I think Warco do one.
|Thread: Better work|
I used to run a blacksmith business and I used to have the opposite problem. I would get a commission to make a pair of gates, when I finished them i was never happy with them. My customers were always extremely pleased with my work. When I saw my later on I used to see them I used then appreciate how good they were!
I was told engineers rarely make good clock makers or blacksmiths!
|Thread: Reaming a large diameter by hand|
I would set it all up in mill so as everything is straight and rigid.
|Thread: Stripped thread / Pultra P type|
If it doesn't take a high load. You could clean the brass nut and tin it, the drill a hole in one side, fit the cross shaft and pour white metal into the hole.
This was a quite common method for making steering box female worms.
|Thread: Help Needed to Identify This 5 Cylinder Radial Engine|
Conrods look an odd design.
Edited By vintage engineer on 24/10/2019 10:05:43
|Thread: Bending stainless rod|
Just the sort of jig used for production work in a forge!
Make a dummy split collet, clamp it solid in a vice and use a oxy propane pepper pot burner to heat it up and the bend to suit. Afterwards pack in dry sand to allow it to cool slowly.
Never cool any steel in water as this could cause chemical changes or hardening. Even mild steel will change it's structure. Unless the steel is "new" you don't know what else is in the steel!
Modern cars now contain all sorts of exotic steels and when the cars are scrapped most of them go through a frag machine which grinds up the steel ready for recycling. This material contains boron, vanadium, chrome, nickel and high carbon steels. This all goes into the pot for mild steel.
Unless you can find a supplier who supplies new steel you really don't know what your buying.
If I need a specific grade of steel I ask for a Certificate of Conformity and the steel is normally more expensive.
|Thread: Limiting pressure to a gauge|
This is a 1910 engine with open oil galleries drip feeding the main bearings and dippers feeding the big ends. The oil is pumped down the exhaust cam, which has oil ports drilled to line up with the galleries as the came rotates. There is no pressure relief valve and it is quite common on early engines not to have one. These engines have large oil pumps and work by supplying a large volumes of oil, rather than low volumes and high pressure.
Thank you all for you advise. I will do some experiments with restrictors or pegging the gauge. The engine is a Dennis Brothers engine and is one of four experimental engines they made for testing a new design, so information is non existing!
I spoke to John Dennis and he checked his records and confirmed that all four engines were scrapped! We think someone sold them out the back door instead of scrapping them!
|Thread: Anyone know about buying freehold to a house in the north|
If they are going to sell it on the open market there must room for profit. If you decide to sell your property the landlord can charge you to reassign the lease to the purchaser.
I would read the lease very carefully.
Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!
You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.
Click THIS LINK for full contact details.
For subscription issues please see THIS LINK.