Spiralock tapping on the machine?

[#Rekd™]

Hi,

 

I have a bunch of 4-40 and 6-32 blind holes to tap in 17-7ss. They are drilled 0.420" deep and threaded 0.25" deep.

 

Spiralock sent me some spiral fluted taps and the first one broke on the first hole. I drilled the hole with a HSS drill close to the largest recommend minor diameter and I used CoolTool II for tapping fluid. They are sending me some Spiral Pointed taps now.

 

Can somebody please advise on how to tap these parts? Do I need to Peck tap (never done that)?

 

Thanks in advance.

 

John

[jeff]

These types of taps have a different tap drill size if I recall.

I've used M10 and M12 Spiralock on my VMC with no issues.

[jeff]

Spiralock chart

[SledGeek]

I've never used spiralock , but i've used emuge with much succeess in 17-7 and 13-8 ss. The spiral flute is usually alot weaker than standard......

 

Rigid tapping ? clutch type holder ?

[bet338]

Hi,

 

I have a bunch of 4-40 and 6-32 blind holes to tap in 17-7ss. They are drilled 0.420" deep and threaded 0.25" deep.

 

Spiralock sent me some spiral fluted taps and the first one broke on the first hole. I drilled the hole with a HSS drill close to the largest recommend minor diameter and I used CoolTool II for tapping fluid. They are sending me some Spiral Pointed taps now.

 

Can somebody please advise on how to tap these parts? Do I need to Peck tap (never done that)?

 

Thanks in advance.

 

John

 

John,

 

I prefer to use form taps when ever possible especially on blind holds. Yea they are harder to elox out if or when they break but they seem to be stronger than cut taps.

 

I've have some jobs that are pecked tap in a VMC. Usually I just post the cycle out than hand edit the code, copying the g84 line but reducing the depth in the first line by half. On some materials pecking more than twice will lead to a o/s thread.

HTH

[#Rekd™]

I've never used spiralock , but i've used emuge with much succeess in 17-7 and 13-8 ss. The spiral flute is usually alot weaker than standard......

 

Rigid tapping ? clutch type holder ?

 

Rigid Tapping.

 

Is CoolTool II okay on 17-7 SS?

[#Rekd™]

John,

 

I prefer to use form taps when ever possible especially on blind holds. Yea they are harder to elox out if or when they break but they seem to be stronger than cut taps.

 

I've have some jobs that are pecked tap in a VMC. Usually I just post the cycle out than hand edit the code, copying the g84 line but reducing the depth in the first line by half. On some materials pecking more than twice will lead to a o/s thread.

HTH

 

They did not offer me a cold form tap, not sure if they make them?

[jeff]

I'm almost positive they make cold form Spiralock taps.

[Cuda84]

I threadmill anything that small. Takes a little longer but you don't have to worry about breakage.

[bet338]

They did not offer me a cold form tap, not sure if they make them?

 

Look to the bottom of the Spiralock chart

Pg. 3 & 4

[s-14]

Spiral Lock has a different thread form than normal threads for vibration resistance and the minor diameters are held tighter.

I have used spiral lock roll taps before. They create alot of tool pressure. Only way I could get 1 1/2 + the diameter for depth

was to peck tap.

[#Rekd™]

Look to the bottom of the Spiralock chart

Pg. 3 & 4

 

They did not suggest this choice???

 

Cold form taps are they done on the machine? any more information on the process?

 

Do they make a Spiralock thread mill?

[#Rekd™]

Spiral Lock has a different thread form than normal threads for vibration resistance and the minor diameters are held tighter.

I have used spiral lock roll taps before. They create alot of tool pressure. Only way I could get 1 1/2 + the diameter for depth

was to peck tap.

 

Is peck taping a Mastercam option or a post setting?

 

Thanks

 

John

[bet338]

Is peck taping a Mastercam option or a post setting?

 

Thanks

 

John

 

John,

I don't know about the option but I would think the post could be altered for it. Like I posted before I usually hand edit in Cimco editor. I guess it depends how many you have to tap as to how much work it would be to copy and paste the G84 line. Sorry but I don't know what to edit to make it happen in the post setting.

[greenxman]

they do make roll form i have 4-40s and the container the taps came in has the tap drill size on the package. tomorrow i will try to post it.

[#Rekd™]

I'm almost positive they make cold form Spiralock taps.

 

Yes they do Jeff, I was going by what the sales guy recommended....

 

How do they work on blind holes?

 

Thanks

 

John

[within a thou]

Peck tapping is a mcam option. on fanuc the only difference is there is a Q value in your G84. Have you considered drilling the hole undersized then circle milling the minor diameter. What could be snapping your taps is your drill is wandering causing the tap to engage to much on one side. The minor drill diameter for a standard 4-40 tap is .089 and at only 1/4 depth you should easily be able to true the hole up with a 1/16 endmill. I have neer tried to peck tap anything that small but use it all the time on large threads to break the chip

[greenxman]

roll tap 4-40 spirallock is .104 -105 hole size.

[Odin]

Allied machine has excellent threadmills(Accuthread 856)... i would check em out.Thats what we mostly use. They are located in Ohio, and have pretty good turn around .

Allied Machine & Engineering

[jeff]

Allied machine has excellent threadmills(Accuthread 856)... i would check em out.Thats what we mostly use. They are located in Ohio, and have pretty good turn around .

Allied Machine & Engineering

 

Spiralock isn't your typical 60 degree thread form, normal threadmills won't work.