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Alchem serves as a reseller of finished prods and strings, and a machining service providing rough unfinished parts to crossbow manufacturers. We do not manufacture archery equipment, finished crossbows, or kits. Links to recommended manufacturers of these items may be found at the bottom of this page. The following is a list of materials and parts we currently supply. Many items are in stock and ready for immediate delivery. Others are produced in response to orders. Additionally we can supply some custom parts in large or small quantities. For a quote, submit a drawing and specifications. Please allow up to 6 weeks for delivery of custom orders.
Our crossbow prods now come with a six inch length of heat shrink tubing serving as a safety strap "sichern". These extend form the center of the prod outward, three inches on both sides. Safety straps are intended to reduce the chance of the shooter or a bystander being injured by a broken limb. Breakage, if it occurs, is nearly always confined to the area of maximum stress, from the center of the prod, to an inch or so beyond the point where the prod presses against the stock. This tubing should not be removed, since to do so creates a danger of injury to the user. If necessary, the safety strap may be covered with leather or some similar flexible material.
We currently manufacture a number of different crossbow prod models to provide our customers with a wide range of draw weights. We have determined that average draw weights will vary slightly from production batch to production batch due to differences in the thickness of the metal, the chemistry of the steel and its resulting hardness. Furthermore, draw weights will vary even within a given batch due to minor differences in the shape (tillering) of the parts. In the past these variations caused our customers a great deal of consternation. One of our customers, by the name of Gene Dwiggins of Rhode Island, built us a testing bench capable of rapidly and accurately determining the draw weight of a prod up to 300 pounds. Therefore we now test every prod we produce and record on its center belly the draw weight determined at 11.5 inches. This information makes it possible for a customer to order the exact draw weight desired. It also makes it possible to estimate the approximate draw weight and energy storage of a given prod when drawn to a distance shorter than the maximum recommended 11.5 inches. For this reason we have devised the following table.
The following draw weight, draw length, and energy table has been compiled to include all of our prod models with a maximum recommended overall draw distance of 11.5 inches. In estimating draw weights and energies we assumed a brace height of 3.5 inches giving an actual maximum draw distance of 8 inches. Data was calculated down to 6 inches of actual draw since shorter draw lengths are not likely to be required by our customers. The following measurements are estimates.
Distances are expressed in inches. Weights are in pounds. It should be noted that the "pound inch" figures following Weight x Draw are not equivalent to energy expressed in inch-pounds.
The actual energy E required to draw a bow W a given distance D may be calculated as follows:
E = .5 x W x D.
W is the draw weight of the bow at distance D.
|11.5" (8" draw)||11" (7.5" draw)||10.5" (7" draw)||10" (6.5" draw)||9.5" (6" draw)|
|Weight x Draw||400||352||308||266||222|
|Weight x Draw||440||390||336||292||246|
|Weight x Draw||480||420||371||318||270|
|Weight x Draw||520||457||399||344||294|
|Weight x Draw||560||495||427||370||318|
|Weight x Draw||600||525||462||396||336|
|Weight x Draw||640||562||490||422||360|
|Weight x Draw||680||600||518||448||384|
|Weight x Draw||720||630||553||474||408|
|Weight x Draw||760||667||581||500||426|
|Weight x Draw||800||697||616||526||450|
|Weight x Draw||840||735||644||552||474|
|Weight x Draw||880||772||672||578||498|
|Weight x Draw||920||810||707||604||516|
|Weight x Draw||960||847||735||637||540|
|Weight x Draw||1000||877||763||663||564|
|Weight x Draw||1040||915||798||689||588|
|Weight x Draw||1080||952||826||715||606|
|Weight x Draw||1120||982||861||741||630|
|Weight x Draw||1160||1020||889||767||654|
|Weight x Draw||1200||1050||917||793||678|
|Weight x Draw||1240||1087||952||819||696|
|Weight x Draw||1289||1125||980||845||720|
|Weight x Draw||1320||1162||1008||871||744|
|Weight x Draw||1360||1192||1043||897||768|
|Weight x Draw||1400||1230||1071||923||786|
|Weight x Draw||1440||1230||1071||923||786|
|Weight x Draw||1480||1297||1134||975||834|
|Weight x Draw||1520||1335||1162||1001||858|
|Weight x Draw||1560||1372||1197||1027||876|
|Weight x Draw||1600||1410||1225||1059||900|
|Weight x Draw||1640||1440||1253||1085||924|
|Weight x Draw||1680||1477||1288||1105||948|
|Weight x Draw||1720||1515||1316||1137||966|
|Weight x Draw||1760||1545||1351||1163||990|
|Weight x Draw||1800||1582||1379||1189||1014|
|Weight x Draw||1840||1620||1407||1215||1038|
|Weight x Draw||1880||1650||1442||1241||1056|
|Weight x Draw||1920||1687||1470||1267||1080|
|Weight x Draw||1960||1725||1498||1293||1104|
|Weight x Draw||2000||1755||1533||1319||1128|
|MODEL||THICKNESS||LENGTH*||WIDTH C||WIDTH T||TIP
WEIGHT IN POUNDS
|PRICE EACH**||SHIPPING WEIGHT|
|1316||3/16"||28 1/2"||1 11/16"||11/16"||1/2"||120 to 140||$65 ($60 foreign)||1.68 lbs (.76 kg)|
|1732||7/32"||"||"||"||"||190 to 250||$65 ($60 foreign)||1.96 lbs (.89 kg)|
|2316||3/16"||"||1 3/16"||1/2"||"||90 to 110||$65 ($60 foreign)||1.25 lbs (.57 kg)|
|2732||7/32""||"||"||"||1/2"||150 to 190||$65 ($60 foreign)||1.25 lbs (.57 kg)|
|3316||3/16"||28 1/2"||1"||3/8"||1/2"||60 to 90||$65 ($60 foreign)||1.25 lbs (.57 kg)|
|3732||7/32"||28 1/2"||1"||3/8"||1/2"||125 to 150||$65 ($60 foreign)||1.25 lbs (.57 kg)|
|6316||3/16"||34"||1"||3/8"||0||50 to 75||$65 ($60 foreign)||1.25 lbs (.57 kg)|
|6732||7/32"||34"||1"||3/8"||0||80 to 110||$65 ($60 foreign)||1.25 lbs (.57 kg)|
Dacron B50 strings are now available to fit all of our prods. Remember to specify the model of prod when ordering. Strings sell for $14.00 if ordered and shipped with a prod or $15.00 if ordered alone. This price includes postage to customers in the US. Strings are available to foreign customers at a price of $14.00, but only when shipped along with another item.
Release Levers & Roller Nuts
Rough cut steel release lever blanks identical to the one depicted on our plan below are available for $16.00 if ordered with a prod, or $18.00 if ordered alone. This price includes postage to customers in the US (Foreign customers pay $15.00 and add Global Parcel Post charges. Shipping weight 0.25 lbs (.11 kg).
Claplock Release Mechanisms & Levers
Unfinished steel claplock release mechanisms, similar to the one depicted on our plan below, are available for $16.00 if ordered with a prod, or $18.00 if ordered alone. These consist of a clapper, hinge plate, and hinge pin. The purchaser must cut the sear to the required length and fabricate any necessary springs. This price includes postage to customers in the US (Foreign customers pay $15.00 and add Global Parcel Post charges. Shipping weight 0.25 lbs (.11 kg).
A photo of our bow irons in use may be seen by clicking here. These are shipped as sets consisting of 2 side plates, 2 blocks, 2 wedges and a stirrup. Sets are rough cut and require customization and finishing. These are designed to fit tillers from 1 1/2 inches to 2 1/4 inches thick. Sets sell for $32 with stirrup or $27 without. Stirrups alone sell for $5. This price includes postage to customers in the US (Foreign customers deduct $1 from the previous prices and add Global Parcel Post charges. Bow irons are available to fit either model 1 or model 2 prods. The wider model 1 irons will accommodate prod models 1, 2, 3, and 6. The narrower model 2 irons will accomodate prod models 2, 3, and 6. Bow irons should not be used with Fast Flite string. Shipping weight 1.20 lbs (.54 kg).