In praise of HM

I found a couple of balls in a tool box I bought at auction. Figured out they were to be used with a trammel of some sort, have used them a few times in the past 25 years, glad I had them.
In use one goes on the end of a trammel pin, then goes into a hole so you can scribe a circle around a hole.
 
silence dogood said:
This is one of the really fine things about HM. I'm always learning something. Silverbullet, I am one of those that never heard of ball trammels. I looked it up and now I know what they look like. But how do you use them?
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Just like silence dogood I had to do a search for ball trammels. Found some pictures but was unable (admittedly a low effort search) to find their purpose or how to use them. Can anyone educate me/us. Either via video/text link or via an example? Thanks
 
silence dogood said:
This is one of the really fine things about HM. I'm always learning something. Silverbullet, I am one of those that never heard of ball trammels. I looked it up and now I know what they look like. But how do you use them?
Click to expand...
Trammels can be used lots of ways , like inside and outside calipers , hermaphrodite calipers also. With combinations of ball on one and scriber point or in or out caliper leg. If you need to layout bolt hole circles and have a start hole the ball end would be centered using the ball the other can be set to scribe or to measure between holes . They use to sell a vernier style trammels but with a good scale you can locate within .005 really easy. Extremely versatile tool ,but with dros there almost of no use. But for me I can say ill keep my set ill know when I do a layout where everything goes. I used mine on many 12foot dia. Tanks and lids , even on missiles for the government , u2 style rockets were fun to build . There lugs were titanium with specified finishes. I think about two thousand at a time . Even the fins had tight specs. YUPP I learned well to use trammels l sure wish I could go back in time just to thank the old guys who taught me. Don't think everything new is always best , old may still be better. Of course you have to use the brain to work them not push a button.
 
It's a sad state of affairs, but one of my current diagnostic tools for unfamiliar problems is google. Yes, there is a ton of self-appointed experts with an attitude out there. They *know* the answer, and as soon as you ask questions beyond their understanding (doesn't take long), they go on the offensive.


Mark, ever heard of Team.net?
 
Silverbullet said:
Trammels can be used lots of ways , like inside and outside calipers , hermaphrodite calipers also. With combinations of ball on one and scriber point or in or out caliper leg. If you need to layout bolt hole circles and have a start hole the ball end would be centered using the ball the other can be set to scribe or to measure between holes . They use to sell a vernier style trammels but with a good scale you can locate within .005 really easy. Extremely versatile tool ,but with dros there almost of no use. But for me I can say ill keep my set ill know when I do a layout where everything goes. I used mine on many 12foot dia. Tanks and lids , even on missiles for the government , u2 style rockets were fun to build . There lugs were titanium with specified finishes. I think about two thousand at a time . Even the fins had tight specs. YUPP I learned well to use trammels l sure wish I could go back in time just to thank the old guys who taught me. Don't think everything new is always best , old may still be better. Of course you have to use the brain to work them not push a button.
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I learn how to use calipers, even the hermaphrodites. many years ago in high school. What a simple thing is just adding a ball to one of the pointers. I'm beginning to get the idea on how to use them and I think I will. May have to get or make them. Thanks Silverbullet. I learned something really big today.
 
Randy: Yes I checked out team.net seems to be mostly British I didn't see any Alfa threads
Mark
 
It was a long shot. Team.net was started long ago by a bunch of autocrossers, an offshoot from a usenet group... long before "internet" was a household word. One of the founders was a Mark S from Cal. I occasionally bump into oldtimers from there on the assorted marque forums.
 
there's not a more stupid person than a smart person.

from Wikipedia

"These are Cipolla's five fundamental laws of stupidity:

  1. Always and inevitably everyone underestimates the number of stupid individuals in circulation.
  2. The probability that a certain person (will) be stupid is independent of any other characteristic of that person.
  3. A stupid person is a person who causes losses to another person or to a group of persons while himself deriving no gain and even possibly incurring losses.
  4. Non-stupid people always underestimate the damaging power of stupid individuals. In particular non-stupid people constantly forget that at all times and places and under any circumstances to deal and/or associate with stupid people always turns out to be a costly mistake.
  5. A stupid person is the most dangerous type of person."
 
Desolus said:
These are Cipolla's five fundamental laws of stupidity:
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Thanks for that....never seen it before.
Do you think it would all fit on a t-shirt? Or maybe a sign for the shop.......hmmm.
-brino
 
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