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Cormorants and Coromants and tips

We are now the proud owners of a decent set of inserted tooth cutters, up to 8" diameter, the latest one of which we bought today on Fleabay. (In case anyone wonders why we bought such large diameter, we have some cylinder heads to rework for a customer)

The question that we will have to ask at some time, and it may as well be now, is: given that older tooling had no hole for a screw to retain it, and was usually held in with a wedge and screw, what is the availability going to be longer term for these 'non-holed' types of insert?

I collected another one today from Ilford, comprising a Clarkson dedlock holder and a 6-tooth cutter, with plain tips also.

Does the panel think that plain tips are going to be around for a while, or should we be looking towards the later type of tooling?

Peter

-- Peter & Rita Forbes Email: snipped-for-privacy@easynet.co.uk Web:

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Reply to
Peter A Forbes
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Serious stuff! :-) That 8" cutter could take up to 50 hp to drive at optimum conditions. Today's new inserted cutters are all about increased capacity, finish and reduced horsepower requirements. As a result it makes commercial sense for machine shops and/or manufacturers, to discard the older cutters and move on.

As regards inserted cutters and availability of inserts, if they are not of an ISO or ANSI standard, rather maker specific, the term "lap of the gods" comes to mind, and Sandvik consider themselves the head honcho in that department. :-(

Carbide tooling is a bit like PCs, keeping up with the latest and greatest can be very expensive unless you're get a commercial payback. My brother, a tooling salesman, winces when he sights my supply of carbide inserts garnered from fleabay, albeit mainly lathe oriented, but not of the latest style. I tend to allow him a little leeway when it comes to milling cutters as the new technology pays dividends on Bridgeports and of course there is the associated friendly pricing..

Tom

Reply to
Tom

Looking at the J&L website, the 8" equivalent is rated up to 10,000rpm, so your

50hp is quite practical and possible if you want to remove some metal quickly.

Peter

-- Peter & Rita Forbes Email: snipped-for-privacy@easynet.co.uk Web:

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Reply to
Peter A Forbes

A 10,000 rpm rating with that size cutter would only relate to attaining a standard of finish rather than increased material removal.

Tom

Reply to
Tom

Re your concern on tips have a ring to Rileys of Sheffield they have a vast selection of new and secondhand tips phone No 01142434703 Colin1544

Reply to
Colin Wildgust

Peter,if your Clarkson cutter uses 3/4" square x 3/16" thick inserts with the corners cut of at 45 deg`s you may have problems finding suppliers.We have a load of these cutters and a few years ago our tooling supplier reckoned there was only one manufacturer still making them.On the other hand they do make a nice job of cylinder heads.To save all the hassle of getting the tips all at the same height I only use one tip for cast iron heads and use a bit of 3/16" sq HSS for ali ones.For bigger heads I have a flycutter made out of 60 x 60 x 300mm solid bar with a inserted tip lathe tool clamped in the end of it.As very few customers spec a "gramaphone finish" nowadays I find it much quicker to grind them on our Lumsden tub grinder.Takes of 0.010" in less than two minutes. regards,Mark.

Reply to
mark

Hi Mark:

They are smaller, about half inch square and 1/8" thick.

Found a few to keep me going :-))

Thanks for the info re the head machining, very useful to know.

Peter

-- Peter & Rita Forbes Email: snipped-for-privacy@easynet.co.uk Web:

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Reply to
Peter A Forbes

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