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Author Topic: Thumb slug and pitch?  (Read 2111 times)

Jish

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Thumb slug and pitch?
« on: September 27, 2006, 09:30:45 PM »
Picked up a used drill a little while back and still learning to drill balls and had a quick question. Say you have a thumb pitch to drill in a ball thats 3/8 reverse and you are using a thumb slug, do you drill the hole for the slug with a 3/8 reverse also? Thanks.
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EboHammer4ever

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Re: Thumb slug and pitch?
« Reply #1 on: September 28, 2006, 06:21:52 AM »
Yes, because if you drill the slug at 0 pitch and then you drill the thumb hole at 3/8ths reverse, you will probably go through the back of the slug and defeat the purpose. Thats it.
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JohnP

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Re: Thumb slug and pitch?
« Reply #2 on: September 28, 2006, 11:46:43 AM »
Normally I completely agree with Storm4ever.  But there can be cases where I don't use this procedure.  For example, if I have a customer that wants to experiment with various pitches with 3/8 reverse being the starting point and moving forward from there.  First, I would use a 1 3/8" diameter slug.  Then I would pitch the hole for the slug at 3/16 reverse.  That would allow me to vary the pitches from 3/8 reverse to 0 without cutting through the side of the slug (unless he has an extremely large thumb hole).  --  JohnP
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astrodanco

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Re: Thumb slug and pitch?
« Reply #3 on: October 01, 2006, 08:45:52 PM »
> For example, if I have a customer that wants to experiment with various pitches

But don't you also have to vary the span when varying the pitch?
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ecc0_9879

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Re: Thumb slug and pitch?
« Reply #4 on: October 01, 2006, 08:47:05 PM »
slug and hole same pitch
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JohnP

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Re: Thumb slug and pitch?
« Reply #5 on: October 02, 2006, 11:35:30 AM »
quote:
But don't you also have to vary the span when varying the pitch?


Depends on how much the pitch is changed.  When a customer wants to try pitch changes and do it as inexpensively as possible I use the procedure I described and wait until we're done experimenting to change the spans, if required.  --  JohnP
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