Thread: Magical mystery tour

Hi Ken
Isnt it a mechanical tacho?

The last one is a sparkplug gapping tool.

Stuart

Originally Posted by Stustoys

Hi Ken
Isnt it a mechanical tacho?

The last one is a sparkplug gapping tool.

Stuart

So is the one to its left in the first pic I think. The tab with slots is for bending the earth electrode to adjust the gap.

Dean

Pic number 2 looks like thread chasers but I don't know much about them so I could be wrong.

Dean

HI,
The Top two Items are both Sparkplug Gap Setters and Checkers. The next two Items are both Mechanical Tachos. The Last Items I am not sure about maybe they are Thread Chasers or for a Thread rolling machine or even some type of crimping tools I dunno ?.

G,day Ken,

I am fairly sure that the item with the dial is a mechanical tacho.

Grahame

Yea those things are thread dies. I have a two holders here that take them, a big one and a little one...

Not the most fantastic design for cutting threads I might add.

Hi RC,
Can the holders be opened quickly?
I was looking at them and the only thing I could come up with was if they could be opened like halfnuts it would save the time of winding them off.

Stuart

I agree with most of the comments, but not sure about the dial thingo being a mechanical tacho.

If I go along with the tacho theory, how would it be used? For example, if the shaft rotates and the dial also rotates, the only way I could see it being useful would be to time the number of revolutions against a clock watch or similar, then apply the scaling factor.

Sounds a bit suss to me.

Ken

Definetely a starrett mechanical tachometer.
Yes you do time the revolutions against a stop watch.
Starrett tachometer?

Dave

Originally Posted by Stustoys

Hi RC,
Can the holders be opened quickly?
I was looking at them and the only thing I could come up with was if they could be opened like halfnuts it would save the time of winding them off.

Stuart

.

My, we are a clever bunch of blokes and sheilas, 'cept me.

Are the mechanical tacho's worth anything, or just nostalgic value. They'd clean up nicely.

Ken

Well I'll be blowed. Also in the box of goodies I received, is a holder exactly as shown in post No. 11.

I looked at it thought it was just an old fashioned tap holder.

Ken

Thanks RC,
I guess it would only take a few turns. Could be hand if you have a lot of thread cutting to do.

Stuart

Originally Posted by neksmerj

Are the mechanical tacho's worth anything, or just nostalgic value.
Ken

A digital non contact laser tachometer will come to you for under $15 incl. postage from China. The same money can also buy you a digital contact tachometer with interchangeable pickup wheels. There was another type of mechanical dial tachometer that did not need to be used with a stopwatch, it worked on the principle of eddy currents just like old car tachometers once did, still very useful today and still work reliably and quite accurately and without needing a battery. But the very simple mechanical units on your pictures are really best exhibited behind glass, look interesting but far too cumbersome to use. Chris