Here is a list of all the postings Dinosaur Engineer has made in our forums. Click on a thread name to jump to the thread.
|Thread: Rounded Torx Screw Removal|
I had a damaged torx screw a few weeks ago on the underside tray of my VW golf. the correct size key was too small and the next std. size key was too big. My initial thought was to drill it out and fit a larger screw ., But I thought one idea was worth a try. I used a small ball pein hammer to spread the metal around the torx insert and then hammered the correct size key in. This worked a treat.
|Thread: Tungsten Alloy|
I used to work for a company that made cancer radiotheropy treatment M/Cs( Linear accelerators) they used tairly large pieces of tungsten in their focusing tungsten autocollimators. A work colleague had two pieces of metal about 300mm x 150mm x 80mm . One piece was aluminium alloy and the other pure tungsten.. He would throw the alum. piece in the air & catch it and then hide it in in his desk drawer . He would then bring out the tungsten piece and place it on his desk top without any body noticing the switch. Sometimes visitors who saw the al. piece throwing and then seeing the machined tungsten piece on his desk would idly try to lift it up. Their reaction was often hilarious. When the visitor was leaving. the trick would be repeated whilst the visitor could still seeing the throwing action - all good fun ! The tungsten piece was allbut impossible to pick up vertically from the top of the desk, it had to slid to overlap the disk edge to get a grip. The M/CS were tested in lead lined (Much cheaper than lead) shelters and left for a period for any small radation levels to dissipate. Happy days.
|Thread: How would this lathe tool be used?|
A chaser is very useful for rounding BSW crests . If measuring the O.D. or "try to fit" BSW threads with sharp crests at nominal O.D. the result will be very loose fitting threads. Better to have the recommended alternative flat crest than sharp crests.
Unless Loctite is now made in China , where would the Chinese get it from ?
|Thread: The size and shape of drill holes|
The problem of removing dowels/pins from blind holes was solved many years ago by having a thread tapped in the end of the dowel/pin. This tapped hole was used with an extractor so that the body of the extractor bottomed out before the thread part when the extractor was turned thus causing the dowel/pin to be pulled out. Dowels and taper pins are commercially available with the tapped holes . I’m not sure about the extractors through hobby shop suppliers but am sure some large toolroom part suppliers will have them but it’s not difficult to make your own. The extractor is a piece of steel with a threaded end protruding at one end . the shank can round , hex or square. The hex shank is best as it can be used with a standard wrench.
|Thread: Nickel Plating|
The problem in plating copper as a base layer is that copper will adhere to" rusty" steel wheras nickel won't. Therefore its particulary important to make sure that the article to be plated is clean.
|Thread: Tool grinding woes|
A piece of small round HSS is often used for large lead threads as the tool can be turned around to the helix angle.
|Thread: HMS Queen Elizabeth: Leak found on new aircraft carrier|
I wonder how they tested the .landing gear & steam catapults without any aircraft ! Could they not have borrowed an F35. The vessel has been commissioned. Why couldn't they have tested the prop.. shafts for leaks before the propellors were fitted.
Surely the navy could have tested the prop.shaft seal in the dry dock. Car manufactures use a gas test to check for windscreen leaks .Maybe the leak could have been found after the vessel was 1st floated . The cost of changing the seal must be quite high. The size of the leak must be seen as significant or they wouldn't return to port. Maybe the leak could get worse ? It's just as well the aircraft manufacturers don't adopt the same test procedures i.e. check it doesn' leak when in sevice !
|Thread: New Lathe Problems advice needed|
|Thread: HSS Straight Shank Counterbore|
The relatively large clearance around the capscrew assumes the cap screw head can be at top tolerance size and if an accurate location is required dowels would be used. The aesthetics of the counter bore is not normally an engineering consideration.
|Thread: Weird triple flute drills|
Have used 3 flute carbide in the past - they produce straight holes to reamer limits.
|Thread: a rat in the house!|
An old remedy for mice & rats is slices of lemon . Apparently they don't like the smell and will keep clear of the odour.
|Thread: Raw black rubber|
I doubt if it's made from rubber. Rubber has largely been superceded by neoprene as rubber is now quite expensive..
|Thread: Looking for 3/32" SQUARE silver steel|
ground flat stock is a more refined steel than silver steel. G.F.S. has the additions of elements such as vanadium which gives a tougher and less distorting ( during heat treatment) steel than silver steel . This allows gauges and other thin section hardened components to be made from GFS that couldn't be made from S.S.
|Thread: Why is everything you buy such rubbish!!|
|Thread: Bubbles in engineering combination squares!|
Try holding one end cap in a vice & twisting the other with a close fitting spanner and "wiggling" off. This worked on my Starrett.. FYI The Starrett vial cost was less than £8 incl. postage quite a few years ago
Vials for the Starrett 12" levels can be obtained from Starrett Jedburgh ( spelling ?) Scotland These may fit. The ends of the Vial cylinder are a press fit on my Starrett level. M/W may be the same.. They were easily removed when I fitted a new vial.
|Thread: Swarf Trivia|
As an apprentice in the late 50's we had a competition between ourselves to see who could cut /make the longest piece of lathe swarf. The record was about 30 metres down the isle between the large lathes in the large machine shop.The M/C shop foreman found out and we apprentices were all gathered together and given a very firm warning- dismissal if done again). I suppose it was a stupid thing to do but at the time we thought it was fun. I'm sure that had it been just one guilty apprentice he would haven sacked but firing all the apprentices would have been a step too far.
Happy days !
Edited By Dinosaur Engineer on 31/07/2017 18:00:17
Edited By Dinosaur Engineer on 31/07/2017 18:00:49
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