[colton_m]

Hello,

I am having some trouble figuring out what kind of set screw is used to plug the coolant channels on the boring bar holders that shipped with our machine.

It's a Lynx 220L

Here are some pictures of what screw I am looking for:

Thanks.

[underthetire]

Looks like a 1/4 npt.

[colton_m]

Looks like a 1/4 npt.

I wish it were so easy

After taking some measurments the pitch is either 0.9mm or 28 TPI, they were too close to tell the difference.

Closest thing I could find in the handbook was 1/8-28 BSP but I don't think it's quite right.

The doosan book says it's "1/8-NPS" that doesn't really make sense to me, it's not a straight thread, they are definatly tapered.

[underthetire]

A 1/4npt is 28tpi and tapered...I'm sure it's the metric equiv, but I'm sure the 1/4npt will fit. Got a loc line kit laying around? Try threading it in.

[colton_m]

A 1/4npt is 28tpi and tapered...I'm sure it's the metric equiv, but I'm sure the 1/4npt will fit. Got a loc line kit laying around? Try threading it in.

I gave the loc line fitting a try but it's 1/8NPT not 1/4. It goes in about 1 full turn then jams. Also 1/8 NPT is 27tpi as I recall?

The small end of the taper on the loc line measures 0.380"

The small end of the taper on the factory plug measures 0.350"


The 28TPI is probobly correct as it is extremely close to 0.9mm, just the diameter is wrong. Any ideas?

[northwestfab]

Our puma is 1/8 npt.