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

Latest topics

» Nut from a pool que ball?
by drawknife Sun Jun 17, 2018 5:29 am

» my composite crossbow lath project
by stuckinthemud1 Fri Jun 15, 2018 6:07 am

» Trouble with my Gafa
by drawknife Fri Jun 15, 2018 2:56 am

» Do all triggers Have claws - what types and claw or no claw
by globalmark Thu Jun 14, 2018 12:19 am

» For Sale: Masai Crossbow
by TonyU Mon Jun 11, 2018 1:15 pm

» Medieval composite bows
by juanjo Fri Jun 08, 2018 5:10 am

» yew and sinew prod help needed
by stuckinthemud1 Thu Jun 07, 2018 1:34 am

» Small gothic crossbow (with wooden lever)
by OrienM Fri Jun 01, 2018 10:35 am

» Binding on the stirrup
by Geezer Sat May 26, 2018 7:26 am

» horn inlay and veneer
by OrienM Thu May 24, 2018 8:44 pm

» Presentation
by c sitas Wed May 23, 2018 4:31 pm

» My latest crossbow
by drawknife Tue May 22, 2018 3:13 pm

» The Arbalist Guild - Around the World
by stuckinthemud1 Sun May 20, 2018 5:32 am

» angles and rivets
by Geezer Fri May 18, 2018 1:16 pm

» morticed nut blocks
by Dark Factor Wed May 16, 2018 12:02 pm

» Crossbow triggers
by Croftage Mon May 14, 2018 1:41 pm

» Cocking lever
by c sitas Fri May 11, 2018 8:09 am

» Late roman crossbow
by Dark Factor Wed May 09, 2018 10:27 am

» Powermaster Madness
by Archer46176 Sun May 06, 2018 8:08 pm

» Fast loading crossbow
by septua Mon Apr 23, 2018 9:22 am

» lashing a glass prod in raw hide?
by kenh Sun Apr 22, 2018 7:00 am

» Balestra Veloce / Leonardo DaVinci
by msalazar2310 Fri Apr 20, 2018 10:37 am

» Goats Foot Lever
by Geezer Wed Apr 18, 2018 12:42 pm

» Hickory and Ipe 180lb flatbow
by actionbow Mon Apr 16, 2018 1:56 pm

» goat foot questions.
by Geezer Sat Apr 14, 2018 10:26 am


    Working with leaf springs

    Share

    Hermit
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?

    Posts : 245
    Join date : 2013-09-10

    Working with leaf springs

    Post by Hermit on Thu Jan 23, 2014 10:39 am

    Many enquiries seem to come in regarding working leaf springs.The first thing to understand,is when you acquire a leaf spring,it is in it's finished condition,for the job it was designed to do.You will be wanting it to do a different job.
                                            In order to alter it to do a different job,you need to first understand how it's made.The spring starts out as a relatively soft piece of steel,it is cut to shape and then bent to the required profile.Once the spring has been cut to shape and bent,it then has to be heat treated(hardened and tempered)heat treatment gives the spring it's "springiness".Leaf springs,once hardened,cannot be bent cold without fracturing or breaking.Leaf springs,like any metal,can be bent using heat.As soon as the spring is bent with heat,it is useless,the temper has been destroyed,and the "springiness" is gone.So how can a leaf spring be worked?.If extensive shaping is required,the spring should be heated and softened(annealed)worked to the required shape,and then re-hardened and tempered.Unless you are an extremely skilled blacksmith,or have access to a highly  sophisticated(and expensive) hardenening and tempering industrial facility,forget it.You can shape,or 'tiller' the bow yourself.The best way to do this would be with an angle grinder.Grinding creates lots of heat,so excessive grinding can destroy the temper,so proceed with caution!Filing I would say,is not an option,filing heat treated steel will dull your file in record time,with little removal of metal.
                      As for using a prod with a hole in the exact centre,Would you try to use a longbow with a hole drilled right through the centre of the handle?
                                               Hermit.

    Rizzar
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?

    Posts : 192
    Join date : 2012-08-11
    Location : Germany

    Re: Working with leaf springs

    Post by Rizzar on Thu Jan 23, 2014 11:14 am

    I totally agree with your points.

    If I had written about it it would have taken me a long time and I would have expressed it more complicated making it harder to follow.
    (which in fact I prepared but was not satisfied with)

    My suggestion for handling the holes still is either
    -stiffening the area with clamp plates
    -grinding the prod so low that there is no hole anymore
    -living with much efficiency loss during lower calculated tension with shorter draw
    -or completely forgetting about leaf springs with center holes cuting them into pieces to forge some beginner knives with the metal.

    btw: Hermit, you´ve got pn!!!

    Rizzar

      Current date/time is Sat Jun 23, 2018 9:50 am