Taper Pins

[Chris VParticipant @chrisv]

Hope to join you in that special club sometime before too long !

Thanks for your input hope it was tapered 😊

Chris.

[not done it yetParticipant @notdoneityet]

Posted by ANDY CAWLEY on 10/05/2020 18:14:43:

Nobody has mentioned the pleasure that fitting a taper pin into a freshly reamed hole gives. Maybe I'm an old saddo but it always brings a smile to my face.

…..

Didn’t this count on that score?

I was chuffed when the job was done and the pin fitted as perfectly as I could expect, and the hole through the inner shaft was adequate without being excessive.

[Chris VParticipant @chrisv]

So there's two in the club, my memberships still pending!

[ANDY CAWLEYParticipant @andycawley24921]

Not Done it Yet, yes of course it does. I apologise for not looking picking up on it. It is an ace feeling isn’t it❓😉✅

Edited By ANDY CAWLEY on 10/05/2020 22:33:05

[not done it yetParticipant @notdoneityet]

I usually get things right by the second attempt but have, in the past, needed three goes at some things before getting the hang of the machining ‘rules’ for the job! This one went smoothly, as these days I go more slowly and think ahead carefully.

Having multiple chucks around allows me to avoid having to swap out workpieces (from the chuck, at least). This particular job was one of those 🙂 and was fitted in among other on-going work. Three chucks and two mills in operation (not all at the same time!). My first chuck back plate was very pleasing, as I recall, from long ago. Since then, most jobs have been repairs, modifications or making replacement parts – no model engines to be completed or anything like that.

As it was the first tapered pin I had attempted (I don’t particularly relish small fiddly bits and pieces) it was satisfying to get it right as I knew as soon as I fitted the pin to the hole that tapers matched perfectly and my time had been well spent. Any more will be easy as it is always the first one that is most troublesome. Only having the one small tapered reamer (of unknown taper) made it important not to get that part of the job wrong. I may never need to do it again, who knows?

At my age I am quietly satisfied when things go well first time. I neither get euphoric over things nor too P’d off if things donn’t go entirely to plan. I just set to and try to do it better, if things go pear-shaped.

Let’s face it, this little job would have been ‘run of the mill’ for a proper machinist!

[Dave WoottonParticipant @davewootton]

Maybe slightly off topic, but if you can't find a cross pin or taper pin in a collar or similar on a shaft, clean the outside diameter of the collar well, almost to a polished finish then apply very gentle heat, if you are lucky a small tell tale ring of grubby oil will appear around the pin .

Doesn't always work but it's helped me out in the past, I used to have to repair print machinery, the makers used to file the pins down and polish the surface, a nightmare to find. Works best on things that have lived in an oily environment, fails miserably on food machinery that's never seen oil or grease!.

Dave

[not done it yetParticipant @notdoneityet]

Posted by Dave Wootton on 11/05/2020 07:21:42:
. Works best on things that have lived in an oily environment, fails miserably on food machinery that's never seen oil or grease!.

Dave

Crack testing fluid an alternative?

[Author]

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