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

Latest topics

» has anyone checked out the sling shot channel lately?
by Andy. Today at 2:11 pm

» Reciprocating Saw?
by c sitas Sun Dec 10, 2017 8:41 am

» Brace Hieght?
by chaz Fri Dec 08, 2017 8:02 pm

» My 2nd crossbow project - german crossbow with cranequin
by fester Thu Dec 07, 2017 12:08 pm

» Hemp cord and nut drilling?
by fester Sat Nov 25, 2017 5:22 am

» My project Powermaster
by EugeneSlagle Mon Oct 30, 2017 1:54 pm

» Lillohus crossbow
by Dark Factor Mon Oct 30, 2017 12:45 pm

» Old Powermaster project & question.
by EugeneSlagle Mon Oct 30, 2017 8:14 am

» Medieval composite bows
by Dark Factor Sat Oct 21, 2017 1:44 am

» Medieval bowyer
by Dark Factor Wed Oct 18, 2017 12:30 pm

» New crossbow builder
by wjbates1430 Tue Oct 17, 2017 2:10 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


    More thoughts on rdt cams.

    Share

    Hermit
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?

    Posts : 245
    Join date : 2013-09-10

    More thoughts on rdt cams.

    Post by Hermit on Mon Nov 03, 2014 1:53 pm

    Since I first saw(and fell in love with)Patandjali's excellent rdt crossbow,and decided to build one,I realised that the difficult parts to build would be the cams,so I'd tackle them first.After much trouble and not a little expense,I managed to locate and buy 3/8ths ins. aluminium plate.Since deciding to build the cams,I have given much thought to how to do it.I considered going with laminated cams,and reluctantly put aside the idea,because I was already into the cams for 60 bucks worth of aluminium plate.The more I think about the idea,the more I like it.
                                                         Cutting out the cams with a jigsaw just didn't work for me,it wasn't accurate enough,was hard on the jigsaw,and to ensure I didn't go to the wrong side of the line I had to leave to much material behind.This meant a hell of a lot of filing.Anyone who has done much filing knows that to file accurately over large surfaces is finicky and requires much time and patience to maintain accuracy and squareness.These aluminium plate cams are thick enough to qualify.
                             If I make these cams again,I will laminate them using 1/8th aluminium flat stock.Epoxy glue is good for joining aluminium,and if there are any worries about delamination(around the outside edge of the big cam for example)rivets can be used,brass rivets would contrast nicely with the aluminium.Laminating also means that material that is more readily available as scrap,or to buy can be used.
                                            Gnome raised a good point about the strength of the laminated cams,I think that a 1/8th inch centre lamination will be more than strong enough on a 3/8th ins. thick cam.I also think that making laminated cams will take no longer than solid plate cams,possibly less time, and use less material.
                 Hermit.

      Current date/time is Tue Dec 12, 2017 8:24 pm