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8:02 pm
NWBA Member
June 24, 2011
Offline
Hello,
I know how to cut machine screws with taps/dies, and have even done it on a lathe in my youth. How do you cut wood screws? Are there dies for that?
I would be happy with straight screws such as those on lagg bolts...but I am also curious about tapered screws too.
I am asking this on IFI as well, in case you see me theree...
Thanks for your time!
--jason
As a beginning Blacksmith, I make scale.
8:12 pm
NWBA Member
July 28, 2010
Offline
There is a jig you can get/make/buy. That allows you to do threading in wood for wooden nuts and bolts. I can not at the moment remember what they are called or one of the companies. Works just like making your own tap and die set. I had been tempted to get some in the past.
8:19 pm
NWBA Member
June 24, 2011
Offline
Hi Raschelle!
It sounds like you are talking about a threadingbox...Hmm. Roy Underhill of "the Woodwright's shop" had an episode or article about making them...
I think my choice of words may have been misleading: I would like to know how lagg bolts are made, not wooden screws.
Sorry for the confusion!
--jason
As a beginning Blacksmith, I make scale.
5:45 am
NWBA Member
July 28, 2010
Offline
Heehee. Looks like I start my day with amusement today. I still think it'd be fun to make the tool to make wooden nuts and bolts. But I have only a partial idea on making lag bolts. You could do it by filing in one at a time.Though I think you're looking for a better way then that. Sorry I'm not more help here this time.
11:03 am
NWBA Member
Board Member
April 26, 2010
Offline
Industrially, they roll them with V.E.D.s (Very Expensive Dies).
Cutting threads on a cylinder is an easy enough prospect. Cutting threads on a cone is not too bad if one has a taper attachment for the lathe or can do the math to set over the tail-stock. Doing both on the same part is extremely easy if one has access to a CNC lathe.
Prior to CNC lathes or thread rolling machines, industry would use a guide similar in function to the lathe taper attachment.
Prior to Mr. Maudsley's lathe, folk used wooden pegs or nails. Mostly wooden pegs.
-
Now, this is just me speculating, but... What if one were to make up a pair of swage dies for a guillotine tool? (Or just a spring tool with the negative of the thread forms?) I suspect the crown of the thread would not be very sharp. Or what if we swadged a blank with an "un-twisted" thread cross section - complete with required taper, and thin twisted it? Viola! Left-handed wood screw. OOPS!
No matter where you go... there you are.
1:59 pm
NWBA Member
August 7, 2010
Offline
Easy Peasy,
Forge your square edged taper. Heat and twist counter-clockwise to make a right-hand thread.
Quench just the tip, hold in a vise, twist quickly with a Twisting Wrench and control amount of twist with a water can. Job done, Finished.
As long as we are above our shoes, We know where we are.:happy:
1:07 pm
May 21, 2015
Offline
Preindustrial wood screws don't have points, but are tapered, with a blunt point. Some old dies can cut a tapered thread, the die is two or more blocks of steel in an adjustable die stock. Most of mine will cut 3 screw pitches, such as 12, 14 and 16 threads per inch. I got mine recently, so don't have alot of experience using them, but already I think I like them better than the type common today. I mine on ebay, and wanted one for cutting a slightly tapered breach plug for a rifle barrel. There's an episode of Woodwrights Shop where the Smith from Williamsburg uses one for threading a bolt for gate hardware as I recall. What size screws are you looking to make.
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