http://www.alcheminc.com/drawdata.HTMCrossbow Parts
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.

http://www.alcheminc.com/crossbow.html


Draw Weight

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)
Draw Weights 50 47 44 41 37
Weight x Draw 400 352 308 266 222
Inch Pounds 200 176 154 133 111
Draw Weights 55 52 48 45 41
Weight x Draw 440 390 336 292 246
Inch Pounds 220 195 168 146 123
Draw Weights 60 56 53 49 45
Weight x Draw 480 420 371 318 270
Inch Pounds 240 210 185 159 135
Draw Weights 65 61 57 53 49
Weight x Draw 520 457 399 344 294
Inch Pounds 260 228 199 172 147
Draw Weights 70 66 61 57 53
Weight x Draw 560 495 427 370 318
Inch Pounds 280 247 213 185 159
Draw Weights 75 70 66 61 56
Weight x Draw 600 525 462 396 336
Inch Pounds 300 262 231 198 168
Draw Weights 80 75 70 65 60
Weight x Draw 640 562 490 422 360
Inch Pounds 320 281 245 211 180
Draw Weights 85 80 74 69 64
Weight x Draw 680 600 518 448 384
Inch Pounds 340 300 259 224 192
Draw Weights 90 84 79 73 68
Weight x Draw 720 630 553 474 408
Inch Pounds 360 315 276 237 204
Draw Weights 95 89 83 77 71
Weight x Draw 760 667 581 500 426
Inch Pounds 380 333 290 250 213
Draw Weights 100 93 88 81 75
Weight x Draw 800 697 616 526 450
Inch Pounds 400 348 308 263 225
Draw Weights 105 98 92 85 79
Weight x Draw 840 735 644 552 474
Inch Pounds 420 367 322 276 237
Draw Weights 110 103 96 89 83
Weight x Draw 880 772 672 578 498
Inch Pounds 440 386 336 289 249
Draw Weights 115 108 101 93 86
Weight x Draw 920 810 707 604 516
Inch Pounds 460 405 353 302 258
Draw Weights 120 113 105 98 90
Weight x Draw 960 847 735 637 540
Inch Pounds 480 423 367 318 270
Draw Weights 125 117 109 102 94
Weight x Draw 1000 877 763 663 564
Inch Pounds 500 438 381 331 282
Draw Weights 130 122 114 106 98
Weight x Draw 1040 915 798 689 588
Inch Pounds 520 457 399 344 294
Draw Weights 135 127 118 110 101
Weight x Draw 1080 952 826 715 606
Inch Pounds 540 476 413 357 303
Draw Weights 140 131 123 114 105
Weight x Draw 1120 982 861 741 630
Inch Pounds 560 491 430 370 315
Draw Weights 145 136 127 118 109
Weight x Draw 1160 1020 889 767 654
Inch Pounds 580 510 444 383 327
Draw Weights 150 140 131 122 113
Weight x Draw 1200 1050 917 793 678
Inch Pounds 600 525 458 396 339
Draw Weights 155 145 136 126 116
Weight x Draw 1240 1087 952 819 696
Inch Pounds 620 543 476 409 348
Draw Weights 160 150 140 130 120
Weight x Draw 1289 1125 980 845 720
Inch Pounds 640 562 490 422 360
Draw Weights 165 155 144 134 124
Weight x Draw 1320 1162 1008 871 744
Inch Pounds 660 581 504 435 372
Draw Weights 170 159 149 138 128
Weight x Draw 1360 1192 1043 897 768
Inch Pounds 680 596 521 448 384
Draw Weights 175 164 153 142 131
Weight x Draw 1400 1230 1071 923 786
Inch Pounds 700 615 535 461 393
Draw Weights 180 169 158 146 135
Weight x Draw 1440 1230 1071 923 786
Inch Pounds 720 615 535 461 393
Draw Weights 185 173 162 150 139
Weight x Draw 1480 1297 1134 975 834
Inch Pounds 740 648 567 487 417
Draw Weights 190 178 166 154 143
Weight x Draw 1520 1335 1162 1001 858
Inch Pounds 760 667 581 500 429
Draw Weights 195 183 171 158 146
Weight x Draw 1560 1372 1197 1027 876
Inch Pounds 780 686 598 513 438
Draw Weights 200 188 175 163 150
Weight x Draw 1600 1410 1225 1059 900
Inch Pounds 800 705 612 529 450
Draw Weights 205 192 179 167 154
Weight x Draw 1640 1440 1253 1085 924
Inch Pounds 820 720 626 542 462
Draw Weights 210 197 184 170 158
Weight x Draw 1680 1477 1288 1105 948
Inch Pounds 840 738 644 552 474
Draw Weights 215 202 188 175 161
Weight x Draw 1720 1515 1316 1137 966
Inch Pounds 860 757 658 568 483
Draw Weights 220 206 193 179 165
Weight x Draw 1760 1545 1351 1163 990
Inch Pounds 880 772 675 581 495
Draw Weights 225 211 197 183 169
Weight x Draw 1800 1582 1379 1189 1014
Inch Pounds 900 791 689 594 507
Draw Weights 230 216 201 187 173
Weight x Draw 1840 1620 1407 1215 1038
Inch Pounds 920 810 703 607 519
Draw Weights 235 220 206 191 176
Weight x Draw 1880 1650 1442 1241 1056
Inch Pounds 940 825 721 620 528
Draw Weights 240 225 210 195 180
Weight x Draw 1920 1687 1470 1267 1080
Inch Pounds 960 843 735 633 540
Draw Weights 245 230 214 199 184
Weight x Draw 1960 1725 1498 1293 1104
Inch Pounds 980 862 749 646 552
Draw Weights 250 234 219 203 188
Weight x Draw 2000 1755 1533 1319 1128
Inch Pounds 1000 877 766 659 564

 

http://www.alcheminc.com/drawdata.HTM

 

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Replies to This Discussion

Prods 
The below listed items are made of high carbon spring steel which has been precisely hardened and tempered for optimal strength and durability. These are available in mill black or plain steel finish. Prods are shipped black and treated to resist rust unless otherwise requested. All models are available in a range of draw weights. When ordering, please specify the approximate weight desired and we shall match your request as closely as possible. Most of our models are designed for a recommended draw of 8 inches from a 3 1/2 inch brace. In other words, allow 11 1/2 inches from the mounted prod to the fingers of the release. The exception is model 6 which is designed for a recommended draw of 10 1/4 inches from a 4 1/2 inch brace. This equals a total distance of 14 3/4 inches from the center of the belly of the prod to the fingers of the release. A greater draw length should be avoided since this may lead to premature breakage of the part. For more detailed draw weight calculations and charts, go to our draw weight data page. 

 

MODEL THICKNESS LENGTH* WIDTH C WIDTH T TIP
RISE
APPROXIMATE DRAW
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)


**(These prices include shipping to US addresses. Orders to be shipped to addresses outside the United States must have international shipping added. Our prods are all longer than 24 inches and must be shipped priority air. Follow this link for Global Parcel Post charges.) 

The following PayPal shopping cart buttons include estimated shipping charges. If you order several crossbow prods and overpay, the excess shipping charges will be refunded.


http://www.alcheminc.com/crossbow.html

Strings 
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.

http://www.alcheminc.com/crossbow.html

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).

http://www.alcheminc.com/crossbow.html

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).

http://www.alcheminc.com/crossbow.html

Bow Irons 
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).

http://www.alcheminc.com/crossbow.html

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Patchwork Merchant Mercenaries had its humble beginnings as an idea of a few artisans and craftsmen who enjoy performing with live steel fighting. As well as a patchwork quilt tent canvas. Most had prior military experience hence the name.

 

Patchwork Merchant Mercenaries.

 

Vendertainers that brought many things to a show and are know for helping out where ever they can.

As well as being a place where the older hand made items could be found made by them and enjoyed by all.

We expanded over the years to become well known at what we do. Now we represent over 100 artisans and craftsman that are well known in their venues and some just starting out. Some of their works have been premiered in TV, stage and movies on a regular basis.

Specializing in Medieval, Goth , Stage Film, BDFSM and Practitioner.

Patchwork Merchant Mercenaries a Dept of, Ask For IT was started by artists and former military veterans, and sword fighters, representing over 100 artisans, one who made his living traveling from fair to festival vending medieval wares. The majority of his customers are re-enactors, SCAdians and the like, looking to build their kit with period clothing, feast gear, adornments, etc.

Likewise, it is typical for these history-lovers to peruse the tent (aka mobile store front) and, upon finding something that pleases the eye, ask "Is this period?"

A deceitful query!! This is not a yes or no question. One must have a damn good understanding of European history (at least) from the fall of Rome to the mid-1600's to properly answer. Taking into account, also, the culture in which the querent is dressed is vitally important. You see, though it may be well within medieval period, it would be strange to see a Viking wearing a Caftan...or is it?

After a festival's time of answering weighty questions such as these, I'd sleep like a log! Only a mad man could possibly remember the place and time for each piece of kitchen ware, weaponry, cloth, and chain within a span of 1,000 years!! Surely there must be an easier way, a place where he could post all this knowledge...

Traveling Within The World is meant to be such a place. A place for all of these artists to keep in touch and directly interact with their fellow geeks and re-enactment hobbyists, their clientele.

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