Crossbows - Everything about Building, Modding, and Using your Crossbow Gear

Latest topics

» New crossbow builder
by wjbates1430 Today at 4:58 pm

» Medieval bowyer
by kenh Today at 3:55 pm

» Airsoft Crossbow-Finished at Last!
by JacobL Thu Oct 12, 2017 7:27 pm

» Powermaster Madness
by c sitas Wed Sep 27, 2017 8:41 am

» Powermaster
by c sitas Wed Sep 20, 2017 9:58 am

» Best wood for a novice?
by Geezer Sun Sep 17, 2017 9:21 am

» Adding a steel sear insert?
by Geezer Fri Sep 15, 2017 7:13 am

» Great Machines
by c sitas Sat Sep 09, 2017 5:39 pm

» Medieval Crossbow Bolts DIY Question
by Rumburak Thu Sep 07, 2017 12:17 pm

» Berkhamsted Castle and Glasgow Museum wooden prod crossbow
by Juniper Fri Aug 25, 2017 3:54 pm

» Beware of Alchem
by Archer46176 Mon Aug 21, 2017 3:33 pm

» How to measure and cut leather for prod
by Celtic Archer Sun Aug 20, 2017 5:56 pm

» Crossbow with built in lever?
by John Edgerton Thu Aug 17, 2017 12:38 pm

» Of Bows and Torsion Engines
by JacobL Mon Aug 14, 2017 12:03 pm

» Early Lever and pin Crossbow
by topfmine Mon Aug 14, 2017 8:56 am

» Crusader crossbow
by topfmine Mon Aug 14, 2017 8:53 am

» First Efforts
by rickraedeke Tue Aug 08, 2017 5:25 am

» aluminum prod
by Phil Abrahams Fri Aug 04, 2017 8:38 am

» First whitetail buck taken with medieval crossbow
by Phil Abrahams Fri Aug 04, 2017 3:38 am

» Airsoft Crossbow
by JacobL Wed Aug 02, 2017 9:11 pm

» Questions about steel prod specs
by JacobL Mon Jul 31, 2017 8:25 pm

» Faking a medieval composite crossbow prod.
by JacobL Mon Jul 31, 2017 8:13 pm

» Airsoft Bow
by JacobL Sun Jul 30, 2017 1:56 pm

» Hello All!
by JacobL Sun Jul 30, 2017 12:54 pm

» Padre Island Bow
by Geezer Wed Jul 26, 2017 12:14 pm


    Downward sloping table - yay or nay?

    Share
    avatar
    kiltedcelt
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.

    Posts : 91
    Join date : 2010-02-17

    Downward sloping table - yay or nay?

    Post by kiltedcelt on Thu Oct 14, 2010 2:12 pm

    I'm getting close to the point where I'll be shaping the tiller for two bows. Neither bow has a quarrel groove but both of them have a small rest at the front of the tiller with a quarrel groove in it. I've seen one guy do a build along for a bow and he actually had the table sloped downwards slightly and that little quarrel rest had its topmost part on a level with the rest of the table and the roller nut. Here is a link to a photo showing his bow before the quarrel rest was installed:

    http://www.stormthewalls.kicks-ass.net/Crossbows/Full/Construction/NoseSlope.jpg

    Here are the two bows I'm more or less trying to duplicate:





    In both cases I can't tell from the photos whether these bows have a sloped table forward of the area where the string rests, which is where I'm assuming the slope would start. Question is, do these bows slope down or would the quarrel rest stick up above the flat surface of the table slightly giving a ramped rest of sorts as Geezer has mentioned some bows having had? How would you make these tillers? Flat from the nut forward, or some downward slope?
    avatar
    DARIVS ARCHITECTVS
    Siege Engineer
    Siege Engineer

    Posts : 34
    Join date : 2010-08-11
    Age : 52
    Location : Ramsey, MN

    Re: Downward sloping table - yay or nay?

    Post by DARIVS ARCHITECTVS on Sat Oct 16, 2010 6:47 pm

    The table begins to slope just in front of the brace position of the string, as you guessed. The reason it slopes is to allow a bit more space in height for the arrow rest which is dovetailed in the stock in a transverse direction. Think of it this way. The arrow rest rises up to meet the quarrel shaft but does not lift the quarrel out of the plane of the string's motion. Nor is it too low such that it offers no support to the quarrel shaft. The amount of slope is rather small, less that half the height dimension of the arrow rest. The less slope, the shorter the arrow rest must be.

    The string must move directly behind the center axis of the quarrel throughout its throw. The area of the table which is sloped never has to contact the quarrel shaft, so there is not friction to slow the quarrel down. The slope offers this small advantage over a full length table groove.

      Current date/time is Mon Oct 16, 2017 9:58 pm