Hah , thought I could not spell bikini didn't ya? or are most of ya-all too young to get it?
I gots yeller spots before my eyes.
That is what the Brits call a "screw plate" I believe
A fellow that I know built a "running" 1/7th size Rolls Merlin V12 aircraft engine The homemade 24 sparkplugs (downfall of the project--although he wouldn't admit it) were 6-32 where they screwed into the heads, and at the top end were threaded 000-120. He bought a tap to thread the nuts, but made a set of chasers for a Geometric die head to thread the male top of the plug.
Not many here are machinists enough to know what a feat making the chasers were--but 120TPI is a smidge over 8 thousandths from one thread to the next---.008333~" to be semi exact. each of the four cutters had to have the threads
.0020833 out of register with the preceding one. Done on a 6x12 surface grinder with a very fine, very hard wheel.
The connecting rod bolts were much easier--they were
00-90, and he was able to buy commercial chasers for them.
The plugs were a failure BTW, because you cant scale down electroons--and it was easier for the spark to jump places other than where it was supposed to.
Good find on the kit of taps!
____________________ Fix it again, Mr Gates--it still works!"
I have as well Herb, 0-80 is not too hard to find and I would rather buy them instead of going to the trouble to tap and thread --besides the set I have ( and the one o E Bay) is metric so it is a horse of a different col--- --- wait -wait --a screw of an odd pitch!
Sorry to hear about your friends Merlin engine --did he ever get it running?
____________________ instant glue?--- SOLDER----- NOW THATS INSTANT!
I know a guy who makes steam engines that run (and a re perfect scale models, he built a triple expanding marine enging that's around 30mm long and 25mm tall) but are so small they use a glass thimble as a display case. He makes his own nuts, studs and bolts he uses some very very small stock 1mm brass hex and phosphor bronze wire for studs....
All to much for me, but I admire his skill and patience...
____________________ There once was a man who said Damn!!
I perceive with regret that I am
A creature that moves
in predestinate groves
I'm not a Bus, I'm a tram