Drive Belt: a Flat Leather Belt of Oak-Tanned Butts, Spliced, Cemented and Sewn (Cooper, 1888)

Before rubber and V-belts, machines were driven by flat leather belts running on crowned pulleys. J. H. Cooper's Treatise on the Use of Belting (1888) quotes how the best English belts were made: only the butt of an oak-bark tanned ox-hide, stretched by machinery and dried stretched, cut in strips joined by feather-edged splices that are cemented and then sewn with strong waxed hemp. Single belts are 3/16 to 1/4 inch thick; heavy double belts, two layers cemented and sewn their whole length, 5/16 to 7/16 inch. The cement, the width, the splice length and the stitching are not given; those are unknown here. Source: J. H. Cooper, A Treatise on the Use of Belting (1888), pp. 82, 116-117. Picture: his Fig. 14, a belt with a tension roller.

متوسط

A day for a short belt

التعليمات

Read Cooper

"For light work, belts of single substance are sufficient, the strips of leather being joined together by feather-edged splices, first cemented and then sewn."

Choose the butts

Use only the butt, the prime part of an oak-bark tanned ox-hide; cut the shoulders off, because they stretch in a different direction from the butt and make a belt run crooked. Stretch the butts hard and let them dry while held extended: good strap butts can be lengthened for good by 4 to 5 inches. The stretching machinery is not described (unknown).

المواد لهذه الخطوة:

جلد مدبوغ نباتيًا1 butts

الأدوات المطلوبة:

سكين ترقيق الجلد

مادة غير معروفة

Cut and splice the strips

Cut the butts into strips of the belt's width, cutting the ends square. Thin the ends to a feather edge so they overlap without a step, and cement the splices. The cement, the width and the length of the splice are not given (unknown).

المواد لهذه الخطوة:

مادة غير معروفة1 cement

الأدوات المطلوبة:

سكين ترقيق الجلد

أبعاد غير معروفة

Sew the splices

Sew each cemented splice with strong, well-waxed hemp: wax the hemp cord with beeswax, pierce the stitch holes with an awl and sew through. A single belt is 3/16 to 1/4 inch thick. For heavy work, lay two (or three) thicknesses together, cement them and sew them through their whole length: a double belt is 5/16 to 7/16 inch thick.

المواد لهذه الخطوة:

حبل قنّب1 as required

شمع النحل1 to wax the hemp

الأدوات المطلوبة:

مِخرَز

History and honest limits

Cooper's treatise gathers makers' and engineers' practice on belting; his sources sewed with waxed hemp or with thin alum-dressed hide, and some riveted double belts with copper or iron rivets by machine. He advises running belts on pulleys crowned slightly in the middle and keeping them supple with a dressing of neat's-foot oil, tallow and rosin. The cement, belt width, splice length and stitch spacing are not given; vegetable-tanned leather stands for oak-bark tanned butts and beeswaxed hemp cord for waxed hemp.