Pellethunter,
Mac has a point there.
Risers are kinda on the advanced crossbow building end, however it's not impossible.
The pro's and cons of riser/no riser:
Riser (Split Limb / Full Limb)
No riser (Full Limb)
Weight
Crossbow is Front Heavy
Light front end
Compactness
Wider prod(limb) for the same draw length.
Limb(s) need to be longer to account for mounting seats.
Shorter prod can be used to get the same draw length as the mounting space is minimized allowing a better part of the limb to work(bend)
Limb system suitability
Risers can be designed with different limb angles(from parralel to past parralel) and can even be designed for an adjustable limb angle and thus can be used both with the bare limbs(D-bow or recurve) or compound assemblies(cammed limbs).
Mainly used with bare limbs.
However crossbows with a compound limb mounted under an angle have been spotted on the outskirts of Russia String Friction
Less to none. String travels straight whether track is present or not. Take care when cutting string nocks as that is one of the elements that is responsible for string height
More. Varies with prod mounting angle and string thickness. More about mounting angle troubles here...link
Ease of construction
Moderate to Advanced - Special tooling and materials may be required depending on the design.
Easy to Moderate - prod can be mounted straight to stock/rail. Cutting a seat with proper mounting angle and stock reinforcement issues seem to be the only major points...the rest lies with the bow "design" and mounting options.
Mounting
Special care should be taken when mounting
risers as great amount of torque is produced.
May require a mounting block bolted to the stock or incorporated into the front end of an arrow track.
Force is directed along the stock axis.
Can be cord bound or mounted using bow irons.
May require a reinforcement bolt to keep the stock from splitting with heavier weight bows.
If I missed something or am mistaken, please correct me...
A riser can also be used with a single limb.
One example where limbs are below the track level is Taiwanese crossbows that press the limb in the center with one bolt using a small steel plate as a spacer(not to harm the limb).
And another version that is with a shoot through single limb...more about it here
The most basic riser I can think of is a piece of angle iron as in the picture...only iron mounted backwards and/or with limbs mounted on the outside to keep the pressure on the riser rather than just the mounting bolts (
Pavise explained it here>>>
About leaf springs...there is an old article that might help you a bit with the tillering(adjusting limb proper bend)
http://www.vintageprojects.com/archery/crossbow-leaf-spring.pdf
...as well as a great crossbow building resource by
basileus that also speaks of using leaf springs.
https://thearbalistguild.forumotion.com/t276-good-page-on-construction?highlight=great+page
[Edit] Pellethuntr wrote:...I had another thought.. I was looking on Ebay at
crossbow prods and I see that there are quite a few for sale in the
100-150 lb range.. If I return the leaf spring I will have about $30
back what do you guys think of these for a first hunting crossbow??
http://cgi.ebay.com/CROSSBOW-150-LBS-Prod-FIBER-GLASS-Replacement-LIMB-Sets_W0QQitemZQQcategoryZQQcmdZViewItemQQ_trksidZp.m263QQ_trkparmsZalgo%3DSIC%26itu%3DUCI%252BIA%252BUA%252BFICS%252BUFI%252BDDSIC%26otn%3D10%26pmod%3D%26po%3DLVI%26ps%3D63%26clkid%3D
http://cgi.ebay.com/CROSSBOW-130-LBS-Fold-Up-MK-180-Prod-Replacement-LIMB_W0QQitemZQQcategoryZQQcmdZViewItemQQ_trksidZp.m263QQ_trkparmsZalgo%3DSIC%26itu%3DUCI%252BIA%252BUA%252BFICS%252BUFI%252BDDSIC%26otn%3D10%26pmod%3D%26po%3DLVI%26ps%3D63%26clkid%3D
Cavwo supply professional and honest service.
If you are looking for more details, kindly visit Taper Leaf Spring.
That #130 limb set isn't powerful enough...it's good for target shooting with light small diameter aluminum shafts, but anything heavier bounces off the target...just my personal experience.
As for the #150 prod...I've been on and off building my younger brother a crossbow for hunting small stuff...don't have any up to date pictures since I started making videos, but there is an older photo with a piece of angle iron and wooden wedges as mounting(couldn't wait to test the trigger )
...at around 14" draw (probably the limit with that prod) that things packs a punch...who would have thought some #20 would make such a big difference.
[Edit]HiMac has a point there.Risers are kinda on the advanced crossbow building end, however it's not impossible.The pro's and cons of riser/no riser:If I missed something or am mistaken, please correct me...A riser can also be used with a single limb.One example where limbs are below the track level is Taiwanese crossbows that press the limb in the center with one bolt using a small steel plate as a spacer(not to harm the limb).And another version that is with a shoot through single limb...more about it here Crossbow Books - Match Target Crossbow Article The most basic riser I can think of is a piece of angle iron as in the picture...only iron mounted backwards and/or with limbs mounted on the outside to keep the pressure on the riser rather than just the mounting bolts (explained it here>>> link About leaf springs...there is an old article that might help you a bit with the tillering(adjusting limb proper bend)http://www.vintageprojects.com/archery/crossbow-leaf-spring.pdf...as well as a great crossbow building resource bythat also speaks of using leaf springs.That #130 limb set isn't powerful enough...it's good for target shooting with light small diameter aluminum shafts, but anything heavier bounces off the target...just my personal experience.As for the #150 prod...I've been on and off building my younger brother a crossbow for hunting small stuff...don't have any up to date pictures since I started making videos, but there is an older photo with a piece of angle iron and wooden wedges as mounting(couldn't wait to test the trigger...at around 14" draw (probably the limit with that prod) that things packs a punch...who would have thought some #20 would make such a big difference.
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