wnmg tool holder

[umahunter]

Does anyone know if anyone makes a wnmg holder for smaller lathes 10x22 in a 1/2 inch holder or 12 mm holder I would like to try these especially since one insert has 6 cutting edges but I'm having trouble finding anything under 3/4 thanks for any help

 

[ch2co]

OK I'm pretty green when it comes to machine tools, but what does WNMG stand for? Is it the type of insert? Whats special about it?
It aint easy being green

 

[mksj]

I am not aware of anybody that makes a WNMG holder in 1/2". The smallest is a 5/8" shank from Seco using a 3/8" insert, which is what I use on softer materials. Since it is a negative rake tool holder, it (and other negative rake holders) is probably not suitable for a smaller machine. Only negative rake holders use inserts that can be flipped, but they require more Hp and a heavier lathe. I would probably recommend a CCMT insert holder like the SCLCR 08-3A. These have two cutting edges, but they last a long time. I use these in the next size up holder and can get 3-6 months on an edge. The inserts are a few bucks, so the cost impact is small for the amount of cutting time, the ISCAR CCMT inserts noted below are great all around ones for general turning. You might also look at a DCMT holder for narrow close in work. The CCMT is also used in other holders like boring bars. Very common and loads of inserts available for very little.

This is a great starter kit.
http://www.latheinserts.com/1-2-HOBBY-LATHE-KIT-500-Lathe-kit.htm
http://www.ebay.com/itm/ISCAR-CCMT3...-SM-IC907-Carbird-Inserts-10pcs-/192137090787
http://www.latheinserts.com/1-2-RIGHT-HAND-DCMT-TOOL-HOLDER-6-805-103R.htm

 

[darkzero]

OK I'm pretty green when it comes to machine tools, but what does WNMG stand for? Is it the type of insert? Whats special about it?
It aint easy being green

WNMG is not actually an acronym & yes it is the type of insert. Each letter of an insert designation is a value, you have to look at a chart to decipher the code. Insert designations are an industry standard and the sizes (numbers after the insert code) are sized in ANSI (imperial) or ISO (metric).

First letter is insert shape, second denotes relief angle, third is tolerance, & fourth is mounting hole type.

What stands out about WNMG is the trigon shape & 0° relief. No relief means it's a negative insert which can be flipped over so 1 insert will give you 6 cutting edges.

But it's a negative insert, not good for smaller machines. Generally you won't find holders for negative inserts with shanks smaller than 5/8" except TNMG (triangle shape).

 

[umahunter]

I am not aware of anybody that makes a WNMG holder in 1/2". The smallest is a 5/8" shank from Seco using a 3/8" insert, which is what I use on softer materials. Since it is a negative rake tool holder, it (and other negative rake holders) is probably not suitable for a smaller machine. Only negative rake holders use inserts that can be flipped, but they require more Hp and a heavier lathe. I would probably recommend a CCMT insert holder like the SCLCR 08-3A. These have two cutting edges, but they last a long time. I use these in the next size up holder and can get 3-6 months on an edge. The inserts are a few bucks, so the cost impact is small for the amount of cutting time, the ISCAR CCMT inserts noted below are great all around ones for general turning. You might also look at a DCMT holder for narrow close in work. The CCMT is also used in other holders like boring bars. Very common and loads of inserts available for very little.

This is a great starter kit.
http://www.latheinserts.com/1-2-HOBBY-LATHE-KIT-500-Lathe-kit.htm
http://www.ebay.com/itm/ISCAR-CCMT3...-SM-IC907-Carbird-Inserts-10pcs-/192137090787
http://www.latheinserts.com/1-2-RIGHT-HAND-DCMT-TOOL-HOLDER-6-805-103R.htm

I have those very holders they work great

 

[umahunter]

Have one with korloy inserts for aluminum and one with seco inserts for steel

 

[springer]

I've wanted to try these but worried about using on a smaller machine. Would a pm1340gt be a large enough lathe for these inserts? Or any negative insert for that matter? Is there a benefit to the wnmg over the tnmg?

 

[darkzero]

I've wanted to try these but worried about using on a smaller machine. Would a pm1340gt be a large enough lathe for these inserts? Or any negative insert for that matter? Is there a benefit to the wnmg over the tnmg?

Yes you will be fine with your lathe with the WNMG & other negatives. Trigon shape is stronger than triangle shape but the trigon will require a bit more HP. You probably won't notice a difference on your lathe unless you are trying really heavy machining like bigger lathes can handle. WNMG costs a lot more than TNMG though, unless you ebay shop.

I have a PM1236 and it does ok with negative inserts. But still I prefer to use positive inserts. The only negative insert I run is CNMG/CNGG, really common so they can be found cheap.

 

[springer]

Yes you will be fine with your lathe with the WNMG & other negatives. Trigon shape is stronger than triangle shape but the trigon will require a bit more HP. You probably won't notice a difference on your lathe unless you are trying really heavy machining like bigger lathes can handle. WNMG costs a lot more than TNMG though, unless you ebay shop.

I have a PM1236 and it does ok with negative inserts. But still I prefer to use positive inserts. The only negative insert I run is CNMG/CNGG, really common so they can be found cheap.

Thanks for the info. I just sold my 1236 and always wanted to try some negative inserts but never got the courage. I figured the 1340 would be ok with them but good to hear from others. My 1340 should be here soon, pretty excited.

 

[Doubleeboy]

One thought if you have a milling machine , is to buy 1 inch tool holders for the insert you favor, get used on ebone, then machine a dovetail in it and you have a toolholder and tool all in one for not much money. If you had a shaper it would a snap to machine the dovetail.