|
|
Post by tractionbob on Nov 30, 2006 20:58:54 GMT
I agree with Tony. As a complete beginner to the hobby I have found Model Engineering: A Foundation Course by Peter Wright to be well worth the money (From Play.com it is £12.99 delivered). There are 400 pages full of basic information supported by excellent drawings and photographs.
|
|
|
|
Post by houstonceng on Dec 1, 2006 19:58:01 GMT
The designation of RH and LH used on these tools by "our" suppliers is nearly always wrong. Possibly because they come from "afar" and lost something in the descrption part of the spec during translation.
Traditionally, a RH lathe tool cuts toward the chuck (ie on the RH side of the work if facing). I was taught, many times - many, many times - many, many, many times - and a long, long time ago (in a far, far distant place) by an aged turner (I think he was suffering his age because he would often repeat something he'd taught me only a few minutes ago) that - wait for it :-
"If you turn the tool downside up and it points to the right, it's a RH tool !"
Personally, I think that's too complex a description - like trying to remember a PIN number by something like "4 times your wife's age in 1980 multplied by the last twi digits in your National Insurance number". But if it orked for him, it'll probably work for you.
BTW. Since the suppliers can't get it right, I only ever buy tooling that I can see a pocture of or by "touchy feely" at the suppliers or an exhibition - never rely on the description without a at least a picture.
|
|
paul
Member
Posts: 8
|
Post by paul on Dec 1, 2006 20:04:54 GMT
|
|
|
|
Post by mrblobby on Dec 3, 2006 20:30:46 GMT
|
|
|
|
Post by houstonceng on Dec 4, 2006 23:21:18 GMT
Mr Blobby
You said "Then grind it into a left hand knife tool (which is the standard tool for turning and facing) thus:"
Sorry to be pedantic but that looks like a RH tool to me.
Andy
|
|
|
|
Post by mrblobby on Dec 5, 2006 5:37:29 GMT
Oops!!! Well spotted my friend - it is a right hand knife tool!
I'm aso eat with my fork in my right hand!
|
|
John Lee
Part of the e-furniture
Posts: 375
|
Post by John Lee on Dec 5, 2006 7:03:53 GMT
Paul, throw those tools in the bin and start from basics, first buy yourself a piece of high speed steel mr blobby Well I would'nt go as far as that, if so throw them in my direction! They could be made into very usable tools with a green grit grinder to sharpen them up and a little knowledge But the advice is still sound, learn how to grind your own, understand about angles and how they vary for different materials, and you will be able to machine absolutely anything. I use a combination of indexable tools for straightforward turning, life being too short to be sharpening all day, and little tools made up as needed from high speed steel, d bits for injector/ejector parts or for fittings as an example. Very easy to make and none of the tools you have there will do that. John |
|
|
|
Post by scottowner on Dec 10, 2006 14:56:59 GMT
Ref indexable tools. Are the tips/inserts specific to the toolholder? Ebay has Sandvik,Carbaloy,Kennametal,Stellram etc etc tips and inserts. Does one have to have a Sandvik,Carbaloy etc toolholder to fit them to ??
|
|
|
|
Post by houstonceng on Dec 10, 2006 15:33:15 GMT
Ref indexable tools. Are the tips/inserts specific to the toolholder? Ebay has Sandvik,Carbaloy,Kennametal,Stellram etc etc tips and inserts. Does one have to have a Sandvik,Carbaloy etc toolholder to fit them to ?? No. You don't have to use a tip and a holder from the same manufacturer BUT you must use the TIP designed for the HOLDER. I don't have it to hand, but there is a "crib sheet" of tip and holder numbering which defines a number of factors like angles of tip, holding mechanism, tip-radius, material, etc, etc. So long as the part numbers of two tips are the same, both tips will fit into the same (correct) holder. Andy |
|
|
|
Post by houstonceng on Dec 10, 2006 15:43:18 GMT
Ref indexable tools. Are the tips/inserts specific to the toolholder? Ebay has Sandvik,Carbaloy,Kennametal,Stellram etc etc tips and inserts. Does one have to have a Sandvik,Carbaloy etc toolholder to fit them to ?? Further to my previous missive, see :- www.shopswarf.orcon.net.nzfor tip and tools to ANSI standards. Andy |
|
John Lee
Part of the e-furniture
Posts: 375
|
Post by John Lee on Dec 10, 2006 18:26:01 GMT
Ref indexable tools. Are the tips/inserts specific to the toolholder? Ebay has Sandvik,Carbaloy,Kennametal,Stellram etc etc tips and inserts. Does one have to have a Sandvik,Carbaloy etc toolholder to fit them to ?? Nope, they are not specific to the manufacturer. There are industry standards for the bits and the tools. Andy, if you have your cribsheet put it on here please, it will be helpful to many I am sure. This www.shopswarf.orcon.net.nz/toolhldr.html is even more confusing I expect. I have settled for 3 standard tips which fit the tools I have, and go back to HSS for the "proper" jobs ;D Regards, John |
|
|
|
Post by scottowner on Dec 12, 2006 11:42:19 GMT
Yes, very confusing. The majority of the holders on Ebay have 4 letters (eg SCMT or CNMG etc) whereas the shopswarf data list shows 5 (example shown MCLNR)
Scottowner
|
|
|
|
Post by scottowner on Dec 12, 2006 11:46:24 GMT
What holders and tips do you have John, and for what do you mainly use them for ??
Scottowner
|
|
John Lee
Part of the e-furniture
Posts: 375
|
Post by John Lee on Dec 12, 2006 15:29:19 GMT
What holders and tips do you have John, and for what do you mainly use them for ?? Scottowner I'll need to check the designations (I got boxes of them years ago at a "gone bust" sale), so sorted out the "likely looking " ones, and have ebayed most of the rest over time. One box to hand now is Kennametal CNMP 432 KC850. Make of that what you will, but I just use it general purpose in different holders as RH, LH (not often) or facing. One of the others is a more round nose finishing tip, the other is a boring tip. I use them for anything basically, providing they are not too big and clumsy. At the none industrial speeds and feeds we use I don't find them critical in any respect. What they are very good at is getting through the hard chilled skin on cast iron, and are tough enough to take intermittents cuts without damage, usually. It sounds mad I know, given the price of these things, but when they get blunt I throw them into a box to be sharpened "oneday". In industrial use they are throwaway. As I said I was in the right place at the right time to get lots. Ohhh, nearly forgot, the same tip goes into a biggish endmill I have, another reason for choosing them, well they rather chose themselves really ;D Regards, John |
|
|
|
Post by houstonceng on Dec 12, 2006 20:55:55 GMT
Yes, very confusing. The majority of the holders on Ebay have 4 letters (eg SCMT or CNMG etc) whereas the shopswarf data list shows 5 (example shown MCLNR) Scottowner The R = Right Hand. Similarly, L=Left Hand (Using the correct standard ie RH is towards the chick) So Shop-swarf and E-bay do match for holders. Tips, I canny speek aboot ye ken !  |
|
