BSP Threading insert help (Old Engineers)

Sulking banned twat Nemo

Sulking banned twat Nemo

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nemo1966 said:
@Hmangphilly
@1260engineer

etc

Need a few inserts for Cutting 1/8 and 1/4 BSP threads ER16 type. Went to buy some here: https://www.shop-apt.co.uk/british-standard-pipe-thread-bspt-external-threading-inserts.html

Looking at the inserts they have ER16 11, ER16 14 and ER16 19 ??? Assuming that the second number is the TPI?

1/4 BSP is 19 TPI and 1/8 BSP is 28 TPI - will the ER16 19 be ok for both?

thanks in advance
Click to expand...
I think the 19 will be too course for 28 threads per inch due to the radi at the root of the thread, do you have a zeus book to hand? Mine are all at work unfortunately.
 
nemo1966 said:
@Hmangphilly
@1260engineer

etc

Need a few inserts for Cutting 1/8 and 1/4 BSP threads ER16 type. Went to buy some here: https://www.shop-apt.co.uk/british-standard-pipe-thread-bspt-external-threading-inserts.html

Looking at the inserts they have ER16 11, ER16 14 and ER16 19 ??? Assuming that the second number is the TPI?

1/4 BSP is 19 TPI and 1/8 BSP is 28 TPI - will the ER16 19 be ok for both?

thanks in advance
Click to expand...
What are you after doing mate or is it just a matter of having the kit
We are talking taps for cutting internal and dies for external threads .
These are taps .
20220827_155912_copy_784x1612.webp

20220827_155920_copy_784x1612.webp

20220827_155917_copy_784x1612.webp

It all depends on what you want to do . there is also a twist . you have straight plug threads and taper threads .
 
1260engineer said:
What are you after doing mate or is it just a matter of having the kit
We are talking taps for cutting internal and dies for external threads .
These are taps .View attachment 45431
View attachment 45432
View attachment 45433
It all depends on what you want to do . there is also a twist . you have straight plug threads and taper threads .
Click to expand...
I have taps and dies for both. I need inserts to cut external threads on the CNC lathe. I was hoping one insert would be OK for both...
 
No mate inserts have different rakes . met is 60 and imp is 55 its the angle the tip is ground at . the thread rate is controlled by the lathe gearbox or cnc prog
I think bsp is 55 if i remember right .
 
Got 3 of these ? Not sure if they are any good. They were brand new when I saved them . Have no clue about threading .

3IR 14 Whitworth VTX Carbide Threading Insert Vardex - engineeringsupplies.co.uk

distributors of quality & performance carbide inserts, toolholders, boring bars, drills, milling cutters, taps, reamers and other engineering consumables.
www.engineeringsupplies.co.uk

4 of these other ones.

All being thrown out .
Picture_20220927040921.jpg
20220827_161742.jpg
20220827_161753.jpg
 
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1260engineer said:
No mate inserts have different rakes . met is 60 and imp is 55 its the angle the tip is ground at . the thread rate is controlled by the lathe gearbox or cnc prog
I think bsp is 55 if i remember right .
Click to expand...
No mate - I mean't one insert to cut 1/4 BSP and 1/8 BSP thread... I don't want to mix metric and Imp threads as i know they are different angles (60 and 55 degree)
 
1260engineer said:
No mate inserts have different rakes . met is 60 and imp is 55 its the angle the tip is ground at . the thread rate is controlled by the lathe gearbox or cnc prog
I think bsp is 55 if i remember right .
Click to expand...
Yep BSP is 55, metric 60 and unc/unf is also 60, you can get away with using UNC/UNF for metric threads and vice versa within reason, ie 16 un you can use for 1.5 pitch etc what is important is the depth of the thread. For example you couldn't use an 18 tpi insert to machine a 16 tpi thread as the 18 tpi doesn't have the depth, however you could use a 16 tpi insert to produce an 18 tpi thread as it is deeper but just won't top the thread.
 
Bighit said:
Got 3 of these ? Not sure if they are any good. They were brand new when I saved them . Have no clue about threading .

3IR 14 Whitworth VTX Carbide Threading Insert Vardex - engineeringsupplies.co.uk

distributors of quality & performance carbide inserts, toolholders, boring bars, drills, milling cutters, taps, reamers and other engineering consumables.
www.engineeringsupplies.co.uk

4 of these other ones.

All being thrown out .View attachment 45453View attachment 45454View attachment 45455
Click to expand...
That top picture is a 14 tpi Whitworth internal if I'm not mistaken, and the other is tpmt/tpmc turning insert, not screw cutting insert..
 
Turner dave said:
Yep BSP is 55, metric 60 and unc/unf is also 60, you can get away with using UNC/UNF for metric threads and vice versa within reason, ie 16 un you can use for 1.5 pitch etc what is important is the depth of the thread. For example you couldn't use an 18 tpi insert to machine a 16 tpi thread as the 18 tpi doesn't have the depth, however you could use a 16 tpi insert to produce an 18 tpi thread as it is deeper but just won't top the thread.
Click to expand...
think he will be fine belongs he gets his starting diameters right . and has depth of cut on his tip . then a quick dress with a quality thread file he should be fine all depending on the fit he wants . and the sort of seal type .
 
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BSP external threads are truncated. 1/4 and 3/8 are same thread depth so can be cut with same insert. You can cut a 1/8 thread with the same insert but it won't be truncated so you'd have to do a bodge ... not advisable for hp air. If you look closely at the inserts you'll see the profile to cut the thread tips.



SmartSelect_20220827-163705_Samsung Internet.webp
 
Turner dave said:
That top picture is a 14 tpi Whitworth internal if I'm not mistaken, and the other is tpmt/tpmc turning insert, not screw cutting insert..
Click to expand...
They were being thrown out at work. All brand new. We no longer did matching there so they were being binned as we were moving to a new building.

I only ever did surface grinding in another job.
 
Bighit said:
They were being thrown out at work. All brand new. We no longer did matching there so they were being binned as we were moving to a new building.

I only ever did surface grinding in another job.
Click to expand...
It's crazy isn't it, what a waste, the company I work for uses sandvik/iscar etc very expensive inserts and the amount of people that use one edge then put them in the carbide bin when they change over set ups is madening.
 
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