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METALGUIDES
METALWORKING NEWSLETTER
A NEWSLETTER FOR METALWORKERS
This newsletter is for machinists, home shop machinists,
gunsmiths and anyone working with metal.
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Volume 1 Issue 3 JUNE 2001
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Jacobs tapers, these are the tapers found in most drill chucks,
tapping attachments, and other interchangeable small tooling.
JACOBS TAPER SERIES
TAPER LARGE
SMALL TAPER
SERIES END
END PER IN.
NO. O 0.2500
0.2284 0.0493
NO. 1 0.3840
0.3334 0.0771
NO. 2 0.5590
0.4876 0.0816
NO. 2* 0.5488
0.4876 0.0816
NO. 3 0.8110
0.7461 0.0532
NO. 4 1.1240
1.0372 0.0524
NO. 5 1.4130
1.3161 0.0517
NO. 6 0.6760
0.6241 0.0519
NO. 33 0.6240
0.5605 0.0635
These dimensions are for the #2 "short" taper
Usual Chuck Capacities for Different Taper Series Numbers;
No. 0 taper, drill diameters 0-5/32 inch;
No. 1. 0-1/4 inch; No.2 0-3/8 inch;
No. 3. 0-17/32"; 1/8-5/8, 3/16-3/4 inch;
No. 4 1/8-3/4, No.5 3/8-1 inch;
No. 6 0-1/2 inch;
No. 33 0-1/2 inch.
NEXT ISSUE WILL COVER BROWN & SHARPE TAPERS
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THIS MONTHS HELPFUL HINTS
Have you ever watched a drill skate around the edge of
a centre-punch mark? - this can be avoided by grinding
the end of the punch like a triangular pyramid. I don't
know why this works, but it certainly does! Try it the
next time you need to cross-drill some round stock.
Getting swarf out of tapped holes - One way to do this
is to purchase a spiral-fluted tap. I don't bother with
these, so I have reverted to using an old dodge. If the
hole to be tapped is filled with tallow, and an ordinary
hand tap is used, as the tap progresses down the hole,
the tallow is extruded out, carrying the chips produced
with it. When the tap has reached the bottom of the hole
in question, the tallow remains, with the remaining chips,
adhering to the flutes of the tap when it is withdrawn,
thus eliminating any problem. Incidentally, tallow is the
stuff to use when tapping aluminum components that are
to be anodised - it doesn't interfere with the anodising
process like some commercially-available tapping compounds.
Copyright 2001 by T.H. Zabel
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Enter our metalworking trivia contest and win a FREE
metalworking guide. First 5 correct answers win the guides.
Just e-mail us your answers to metalguides@hotmail.com
Please put answers in the subject line.
31. A micrometer graduated to read to .0001" usually has:
(a) no vernier scale (b) a vernier scale on the anvil
(c) a venire scale on the barrel
(d) a venire scale on the thimble.
32. A profilometer is an instrument which may be used for:
(a) tracing outlines on shop drawings (b) measuring surface
roughness (c) controlling movement of the shaper toolslide
(d) measuring the areas of irregular figures.
33. Assume that a tapered shank having a 0.600 inch per foot
taper goes into a taper gage too far by 0.200" From this it can
correctly be said that the diameter of the taper is too small
by: (a) 0.005" (b) 0.010" (c) 09.015" (d) 0.020"
34. With reference to the measurement of hardness,
a "Brale" is a: (a) hardened steel ball 1 centimeter in diameter.
(b) Moh's scale of hardness of 3 (c) hardened
steel ball 1/16" in diameter (d) diamond cone
35. A brinell number of 400 corresponds most nearly to a:
(a)Rockwell "C" of 42 (b) Rockwell "B" of 84
(c) Sclerscope number of 21 (d) tensile strength of 84,000 psi
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ANSWERS TO APRIL TRIVIA CONTEST
1=D, 2=D, 3=B, 4=C, 5=A.
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