1/2" Shank Micro Tap Guide
Pee Dee Thread Measuring Wires
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#20MTG 1/2" Shank Micro Tap Guide $16.50
3/16" diameter spring loaded point that can be reversed.
The tip has a point on one end (l) and a concave taper (c) on the other. It is disassembled to switch between the two ends (r).
The point will retract 1/2" into the body.
It Can be chucked up in the lathe tailstock or the drillpress
The point is placed in the small hole at the end of the tap wrench (did you ever wonder what that hole was for?) and the tailstock advanced until the tap is against the hole and the point is fully retracted. You can also use this without a tap wrench if the tap has a center hole. Turn the tap with a regular wrench that fits the flats.
As you turn the tap wrench, the point springs forward, maintaining pressure againt the wrench, keeping it in alignment with the hole you are tapping.
The concave end is good for smaller taps, which usually have a 60 deg. taper ground at the end.This allows great support and alignment. Use a tiny wrench to turn the tap.
No.16 Pee Dee Thread Measuring Wires $38.50
48 Wires - 16 Different Sizes
Measures Threads from 3 to 48 Threads per Inch
Comes with Plastic Sleeve and Charts for Use
Often Copied, Never Equalled
Measuring Thread Pitch Diameter
.045 Wires (specified in chart), 13 tpi thread, measures
.515" over wires.
When cutting a thread to a specified PD, add the constant
to the minimum and maximum PD (found in Machinery's Handbook).