Making taper reamers & pins

Afternoon all:

I will be needing to use taper pins of varying diameters and lengths, and saw that ones offered on eBay can be expensive.

I’ve made very basic taper reamers in the past, but only to open out holes in non ferrous metals,

Has anyone had any experience of making both reamer and matching pins at all that you’d care to share?

Mike

Edited By Mike Waldron on 14/02/2020 15:54:16

Assuming that you want model engineering sizes, an online visit to a shop specialising in clocks (or eBay) may be useful.

A set of clock taper reamers is not expensive and they will sell the pins to match.

Brian

Thanks for those suggestions Brian.

The sizes are for making tools mainly, rather than smaller ones for Model Engineering.

I’m presently making Edgar Westbury’s toolpost indexing device(1948 I think), and having used 3/4” dia steel for the quill, I’m going to put a 1” ring at one end, pinned in place to save laboriously removing large lengths of 1” steel down to 3/4”!
This butts up against the latch holder that bears the detent tooth.

I don’t like reducing large amounts of steel to swarf, so I plan to pin the narrow, larger diameter rings on - 3 times, as I have 3 fittings to go it: a drilling attachment, an indexing attachment and a small grinding spindle.

Mike

Edited By Mike Waldron on 14/02/2020 16:21:23

Edited By Mike Waldron on 14/02/2020 16:22:02

Just turn a silver steel toolmakers reamer to a taper at the same setting as you use for the pins. Then file it awy to 50% thickness before hardening and tempering.

I've done this for small ones up to 3/8" diameter with no problems.

Neil

Sounds interesting; can you post a reference to details of this?

Weld a nut, or similar, to the shaft and just turn that down? Even thread for a fitting and loctite/weld it in place? It’s clearly not needed to be removed.

How load bearing do these parts need to be? There might be other simple solutions. Even how long are these shafts - if short, just get on and remove the 1/8” on the lathe.

Ega: Send me your email if you’re interested in seeing the article.

i can’t find a way of getting the photos on to this thread.

It’s easier to send them as attachments

Mike

Edited By Mike Waldron on 14/02/2020 19:20:26

Thanks Neil.

it confirms my thoughts that to set the top slide over and cut both the tools and ins at the same time is workable.

The post about reamers and injectors seem to give HSS a try...though that might mean same angle might be difficult to achieve, as HSS needs grinding.....!

and I don’t have welding gear... had to get rid of my arc welder when I had a pacemaker fitted.

Mike