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Another Lathe Question
- Thread starter gmhill33
- Start date
tdkkart
Well-known member
If you know the number of the one you want, or a similar one, go to evilbay and see what you can find. I've picked fairly good size lots for pennies on the $$.
If you know the number of the one you want, or a similar one, go to evilbay and see what you can find. I've picked fairly good size lots for pennies on the $$.
I don't know that part number.
justanengineer
Well-known member
I truly do not mean to offend you when I say this, but if youre asking this question then you shouldnt be using carbide tooling period.
There are many myths regarding machining in the home shop. Many people think that carbide insert tooling is THE modern way of machining or the only way to learn bc you dont have to grind cutting tools and a host of other reasons. The fact of the matter is that HSS (high speed steel) is more often the better alternative bc you can grind it, bc its dirt cheap compared to carbide, bc it doesnt mind an interrupted cut, bc you dont have to have the lathe speed cranking hard (carbide requires significantly higher speeds than HSS) and quite a few other reasons. Unless youre turning VERY hard materials (think iron, 4000+ steel, or anything hardened), or need to take deep or fast cuts, I would strongly suggest avoiding carbide. Learn to grind a HSS tool freehand (you will thank me later), slow down a bit, and learn to operate the machine (along with the usual sources for tooling) before you worry much about making large volumes of parts or going to harder materials.
There are many myths regarding machining in the home shop. Many people think that carbide insert tooling is THE modern way of machining or the only way to learn bc you dont have to grind cutting tools and a host of other reasons. The fact of the matter is that HSS (high speed steel) is more often the better alternative bc you can grind it, bc its dirt cheap compared to carbide, bc it doesnt mind an interrupted cut, bc you dont have to have the lathe speed cranking hard (carbide requires significantly higher speeds than HSS) and quite a few other reasons. Unless youre turning VERY hard materials (think iron, 4000+ steel, or anything hardened), or need to take deep or fast cuts, I would strongly suggest avoiding carbide. Learn to grind a HSS tool freehand (you will thank me later), slow down a bit, and learn to operate the machine (along with the usual sources for tooling) before you worry much about making large volumes of parts or going to harder materials.
I truly do not mean to offend you when I say this, but if youre asking this question then you shouldnt be using carbide tooling period.
There are many myths regarding machining in the home shop. Many people think that carbide insert tooling is THE modern way of machining or the only way to learn bc you dont have to grind cutting tools and a host of other reasons. The fact of the matter is that HSS (high speed steel) is more often the better alternative bc you can grind it, bc its dirt cheap compared to carbide, bc it doesnt mind an interrupted cut, bc you dont have to have the lathe speed cranking hard (carbide requires significantly higher speeds than HSS) and quite a few other reasons. Unless youre turning VERY hard materials (think iron, 4000+ steel, or anything hardened), or need to take deep or fast cuts, I would strongly suggest avoiding carbide. Learn to grind a HSS tool freehand (you will thank me later), slow down a bit, and learn to operate the machine (along with the usual sources for tooling) before you worry much about making large volumes of parts or going to harder materials.
I don't necessarily have to have carbide, I can have the HSS. I looked on my paper (a guy I know wrote the number down) and the part number is GTN 2 DC740. I have the isgar self grip holder and a guy I know got me one of these inserts because when I bought the lathe it didn't come with one. The guy I know has moved onto another job and can't get them now so I thought I'd ask just to have a couple around.
toolchaser
Well-known member
Check with Curtis @ Lathe inserts.com. He's an ex KennaMetal rep that went independent good guy & knows his stuff on inserts!
Check with Curtis @ Lathe inserts.com. He's an ex KennaMetal rep that went independent good guy & knows his stuff on inserts!
Thank you for the info I check with him.
Steve from Socal
Well-known member
Cut off inserts are expensive no matter where you find them.
In order to use these inserts and the tool holder for them you will need a rigid tool block and a fair amount of power. You should also lock down the carriage and power feed the cut. Carbide works best when it is taking a fairly heavy cut and at constant feed pressure. Parting is one of those things that seems very simple and gives many people fits. The part itself and the spindle tooling need to be very rigid as well. If it is a small part the cut should be made just clear of the chuck or collet, cutting long thin pieces stuck far out is a disaster waiting to happen.
Steve
In order to use these inserts and the tool holder for them you will need a rigid tool block and a fair amount of power. You should also lock down the carriage and power feed the cut. Carbide works best when it is taking a fairly heavy cut and at constant feed pressure. Parting is one of those things that seems very simple and gives many people fits. The part itself and the spindle tooling need to be very rigid as well. If it is a small part the cut should be made just clear of the chuck or collet, cutting long thin pieces stuck far out is a disaster waiting to happen.
Steve
Griff93
Well-known member
I have both HSS and carbide parting tools. I'd much prefer the carbide for cutting steel. I use the HSS for aluminum. I find a larger relief angle works much better with aluminum. I do not use carbide for turning aluminum either. They each have their correct uses and to be efficient with making parts, you really need both.
Here's a good place to get familiar with being that you have a lathe. http://www.use-enco.com
Here's a good place to get familiar with being that you have a lathe. http://www.use-enco.com
J.Lind
Well-known member
Key to parting is, like everything else, speeds and feeds. On CNC machines we part with carbide, but any time I'm making tooling I part with HSS and cutting oil. It's slow, but it makes a nice, controlled cut.
BillK
Well-known member
MSC, Travers, Enco, McMaster Carr among others.
tcsalvage
Well-known member
thought i still had some in my other box but must of gave them back when i left. still have a bunch of high speed though and i agree with justanengineer; learn to grind high speed its alot more forgiving and wont break the bank when you burn them up.
spongerich
Well-known member
I have a few that I'd be willing to part with (no pun intended). PM the dimensions to me and I'll see if they're the same.
Key to parting is, like everything else, speeds and feeds. On CNC machines we part with carbide, but any time I'm making tooling I part with HSS and cutting oil. It's slow, but it makes a nice, controlled cut.
Totally agree on parting with HSS; set your tool slightly below center, use heavy oil; feed from the start
Torque1st
MEMBER EMERITUS
John in OH
Well-known member
I truly do not mean to offend you when I say this, but if youre asking this question then you shouldnt be using carbide tooling period.
There are many myths regarding machining in the home shop. Many people think that carbide insert tooling is THE modern way of machining or the only way to learn bc you dont have to grind cutting tools and a host of other reasons. The fact of the matter is that HSS (high speed steel) is more often the better alternative bc you can grind it, bc its dirt cheap compared to carbide, bc it doesnt mind an interrupted cut, bc you dont have to have the lathe speed cranking hard (carbide requires significantly higher speeds than HSS) and quite a few other reasons. Unless youre turning VERY hard materials (think iron, 4000+ steel, or anything hardened), or need to take deep or fast cuts, I would strongly suggest avoiding carbide. Learn to grind a HSS tool freehand (you will thank me later), slow down a bit, and learn to operate the machine (along with the usual sources for tooling) before you worry much about making large volumes of parts or going to harder materials.
+1 Regarding what justanengineer says. Hand-ground HSS bits are the way to go if you are just learning or just doing occasional machining on a home-shop lathe. Also, most of the older, smaller lathes do not have the spindle speeds necessary to successfully use carbide tooling.