Drilling large holes

[Peter SpinkParticipant @peterspink21088]

Thanks for that – just finished making an arbor for them whenI saw your post!

Two ordered.

Peter

[davebParticipant @daveb17630]

Many years ago I worked for an scientific instrument maker. Ball ended screws were used to level the bases of surveying instruments, these got damaged occasionally and were trued up in a lathe with a hand held tubular tool, the hole slightly smaller than the ball and the tool ground flat across the front. The tool cut slowly (negative rake) and produced a very fine finish.

Not much good for forming a ball from scratch but if you use the incremental method to form the ball, would probably give a nice finish.

Dave

[peak4Participant @peak4]

Posted by ian j on 22/01/2017 13:57:43:

Just a heads up. Cromwell tools have 14mm & 18mm short (25mm) rota broach cutters for sale at 78p & 89p respectively, inclusive of vat. Free postage on orders of £20. Their silver steel is a good price as well.

Ian

Ian, don't suppose you have a link for them do you?

Can't see them on their site anywhere, and I'll be in Sheffield tomorrow.

Thanks Bill

[ianjParticipant @ians]

mmm, they were here but looks like the offer has finished !

**LINK**

 

Maybe worth calling in to their shop to see if they have any as this was a online offer.

 

I wonder if I will get mine?

Edited By ian j on 23/01/2017 20:52:16

[peak4Participant @peak4]

Posted by ian j on 23/01/2017 20:40:40:

mmm, they were here but looks like the offer has finished !

**LINK**

Maybe worth calling in to their shop to see if they have any as this was a online offer.

I wonder if I will get mine?

Edited By ian j on 23/01/2017 20:52:16

Or a typo on their part. Good luck

Bill

[ianjParticipant @ians]

Your correct Bill, I received an email from Cromwell tools

"We are very sorry, but we made a mistake with our pricing updates over the weekend which has impacted your order"

I just need to cancel the order and get a refund now!!

[Peter SpinkParticipant @peterspink21088]

Bad luck – mine arrived yesterday . . . .

Ordered a few other cheap bits and pieces as well.

Great service

[Author]

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