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 Post subject: DIY Crossbow
PostPosted: Tue Mar 12, 2019 7:05 pm 
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Attachment:
File comment: this pic shows the arrow embedded in the catalogue.
14.jpg
14.jpg [ 167.87 KiB | Viewed 343 times ]
I have always been fascinated by medieval Armour. I know absolutely nothing about archery there fore this crossbow is not built with any scientific knowledge about the draw strength, accuracy, weight of arrows etc. It is just something that i loved doing. I hope you like my handiwork.The car leaf spring was given to me by a friend and i don't have any idea from which type of car it originated. At the centre it was 6mm thick. The wood used for the stock is Beech.After sanding it was finished off with wax. I tried the crossbow in an open place to see how far it could shoot and after shooting in rather windy conditions, the distance measured was 98 metres.


Attachments:
File comment: The marking and cutting of the spring from the original car leaf spring.
Crossbow2.jpg
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File comment: This pic shows the cutting of the profile from the original spring.
Crossbow3.jpg
Crossbow3.jpg [ 244.82 KiB | Viewed 343 times ]
File comment: this shows the cut leaf spring.You can see the four dowel holes at the centre part that prevent the leaf spring from twisting sideways.
crossbow4.jpg
crossbow4.jpg [ 121.76 KiB | Viewed 343 times ]
File comment: This pic shows the diagram of the trigger and the centre part cut from 3/8 inch steel flat bar.
Trigger6.jpg
Trigger6.jpg [ 170.9 KiB | Viewed 343 times ]
File comment: This pic shows the trial fitting of the trigger, leaf spring and the front loop.
assembly7.jpg
assembly7.jpg [ 274.93 KiB | Viewed 343 times ]
File comment: The initial shaping of the wooden stock.
stock8.jpg
stock8.jpg [ 264.13 KiB | Viewed 343 times ]
File comment: In this photo you can see the continued shaping of the wooden stock.
Stock9.jpg
Stock9.jpg [ 270.85 KiB | Viewed 343 times ]
File comment: this shows the crossbow without the burned decorations.
stock10.jpg
stock10.jpg [ 181.53 KiB | Viewed 343 times ]
File comment: This pic shows the decoration at the end part of crossbow.
stock 11.jpg
stock 11.jpg [ 197.84 KiB | Viewed 343 times ]
File comment: A closeup of the decoration burned on the front part of the crossbow.
stock 12.jpg
stock 12.jpg [ 178.05 KiB | Viewed 343 times ]
File comment: This pic shows the finished crossbow.
finished12.jpg
finished12.jpg [ 191.09 KiB | Viewed 343 times ]
File comment: these are arrow bolts that i made, but they are rather heavy so i purchased a set of aluminium arrows from the internet.
bolts 13.jpg
bolts 13.jpg [ 158.11 KiB | Viewed 343 times ]
File comment: This photo shows the result of shooting an arrow from a distance of 10 metres at a rather thick catalogue. You can see that the arrow which has a rather broad profile, penetrated 408 pages.
15.jpg
15.jpg [ 178.02 KiB | Viewed 343 times ]

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 Post subject: Re: DIY Crossbow
PostPosted: Tue Mar 12, 2019 7:25 pm 
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That's awesome, great bit of work. Amazing the power and distance you can achieve from a simple bit of steel.


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 Post subject: Re: DIY Crossbow
PostPosted: Tue Mar 12, 2019 9:52 pm 
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That is totally awesome!!

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 Post subject: Re: DIY Crossbow
PostPosted: Tue Mar 12, 2019 10:23 pm 
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A budding William Tell.. :lol:

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 Post subject: Re: DIY Crossbow
PostPosted: Wed Mar 13, 2019 8:32 am 
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Brilliant Roctiv :thumbright:

The work put into machining that spring was epic.

Bookmarked for future reference! (although there are plans for similar devices online if anyone is interested).

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 Post subject: Re: DIY Crossbow
PostPosted: Wed Mar 13, 2019 11:51 am 
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It's a great job!
Deceptive how powerful they actually are.
What's the pull like to load it?


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 Post subject: Re: DIY Crossbow
PostPosted: Wed Mar 13, 2019 3:50 pm 
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Cool. Do you know the draw weight?


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 Post subject: Re: DIY Crossbow
PostPosted: Wed Mar 13, 2019 5:22 pm 
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Nice bit of work , I should perhaps get on with the one I started years ago and has sat in the shed since . If I may I'd say to try putting the bow on the other way . Looking at the sixth picture it's unstrung and the arms are pointing towards the butt. Turning it around so it looks like a Y when unstrung will give it far more poundage , far more power. You may even need mechanical assistance to span it then.


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 Post subject: Re: DIY Crossbow
PostPosted: Wed Mar 13, 2019 7:52 pm 
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Rorschach wrote:
That's awesome, great bit of work. Amazing the power and distance you can achieve from a simple bit of steel.

Thanks, glad you like it.
To tell you the truth, i had to taper the original leaf spring two times until it was malleable enough so that i could pull the string for a distance of six and a half inches. when i shot it the first time i was truly amazed with the power it unleashes the arrow.

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 Post subject: Re: DIY Crossbow
PostPosted: Wed Mar 13, 2019 7:54 pm 
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Razor wrote:
That is totally awesome!!

Glad you like my modest work.

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 Post subject: Re: DIY Crossbow
PostPosted: Wed Mar 13, 2019 7:59 pm 
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kellys_eye wrote:
Brilliant Roctiv :thumbright:

The work put into machining that spring was epic.

Bookmarked for future reference! (although there are plans for similar devices online if anyone is interested).

It took a bit of work with the angle grinder as i had to cut it twice because the first time it was still to stiff so i had to narrow it to enable me to draw it backwards the distance to the trigger. The rest of the finishing was carried out with flap discs, files and a lot of elbow grease.

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 Post subject: Re: DIY Crossbow
PostPosted: Wed Mar 13, 2019 8:01 pm 
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Gadget wrote:
A budding William Tell.. :lol:

As a matter of fact, i was looking for an assistant willing to hold an apple on his head for target practice. If you would like to volunteer, I'll be much obliged :-)

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 Post subject: Re: DIY Crossbow
PostPosted: Wed Mar 13, 2019 8:13 pm 
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Dave54 wrote:
It's a great job!
Deceptive how powerful they actually are.
What's the pull like to load it?

Yes they are quiet powerful, in fact in olden times they managed to pierce the body Armour. As i am inexperienced and have no instruments to test the pull, I suspended the spring from the middle and attached two 25 kgs bags of cement. They pulled the spring about five inches downward. Since when i pull the string 6.5 inches to engage with the trigger i estimate the pull to be around 60kgs to 65 kgs. But as i said , its only guesswork.

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 Post subject: Re: DIY Crossbow
PostPosted: Wed Mar 13, 2019 8:16 pm 
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Argyll wrote:
Cool. Do you know the draw weight?

as i said in the post above, i estimate the draw weight to be about 60 / 65 kgs, but i may be wrong.

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 Post subject: Re: DIY Crossbow
PostPosted: Wed Mar 13, 2019 8:27 pm 
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Grendel wrote:
Nice bit of work , I should perhaps get on with the one I started years ago and has sat in the shed since . If I may I'd say to try putting the bow on the other way . Looking at the sixth picture it's unstrung and the arms are pointing towards the butt. Turning it around so it looks like a Y when unstrung will give it far more poundage , far more power. You may even need mechanical assistance to span it then.

Yes it would be nice if you complete the one you started maybe i could get better ideas to improve my work. I agree that if you invert the string it would give you more power, but mechanical assistance would be required. To be honest i was afraid to push the spring to its limit as i read that it could break and injure you and being totally inexperience, i was a bit cautious in that regard. One mistake i made was that the groove holding the arrow was too shallow and next time I'll try to devise a better trigger system as the present one is rather stiff to pull and it has no safety catch.

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