steveo

Same deal as always, 100 points to whoever can explain why these two have different designs.... why wood (pun intended) you prefer one over the other ?
Or why wood you use one and not the other ?
Beats me, maybe the historians will know.. who's in the know now?

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Glenmore

They are both wood bits the first one I wood prefer because it is faster becuse closer bitting surface the second one is the same as the first but would drill slower becuase the bit is more widely spaced.

Mike

I think you will find the correct answer by looking at some Kreg pocket hole screws. These bits are designed for different types of wood!

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Mike

reible

Here is a little slow loading but interesting pages from a old time catalog

http://www.roseantiquetools.com/id143.html

Some even came in mm for all you metric people........

Mike

Page 81, paragraph 3 from the auger bit catalog verified that the double twist is for soft wood, the single twist is for hard wood, exactly the same as the Kreg Pocket hole screws.

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Mike

reible

The problem here is they never define what a single twist is or what a double twist is...... On page 82 we see a bit that is good for both woods and then on page 87 the bit is good for both woods.....

Then they talk about "coarse" and "fine" screws being applied to either single or double twist.....

Now for Kreg the fine thread vs the coarse is easy to see but we would not say that a fine thread is a double twist...... anyway I'm confused.

I have both types pictured and I can not say I ever thought about which to use for want wood. I do know that my uncle had a hand drill press (you cranked it hand) and he had the bits with more twists per inch..... and the power ones you buy have the more twists per inch so maybe it has something to do with speed of rotation too??????

Ed

steveo

ooooooooooooooooooooooo
Winners
ooooooooooooooooooooooo

Its my party and this is the conclusion.... points to each of ya all..
50 points to glenmore for being on the track
100 points to aniceone2hold for the first complete answer
and 50 points to reible for the research

Mark, please dole out the points, or else I will from my "pot".

from the reasearch... "it should be clearly understood that the double thread bit is intended for soft wood, the single thread for hard wood, as the latter will not clog as readily as the former, while if the double thread were left course enough not to clog, it would make the bit bore too hard".

I only have two of the double thread bits, was gonna go out in the shop later and try to drill some cedar and hardwood and see for myslef, but the shop is COLD. we in central IL got hammered last night with freezing rain and a snow cap.