CalcResult

"Bonnyrigg" Archery Stands

General view of full stand. Note how the rear cross bar is slightly wider than the rear legs, to match the front legs when folded.

Detail of top cross bar joint to front leg - a simple lap joint will speed up construction time considerably, at the cost of a slight decrease in rigidity.

Joint between front & back legs - top of back leg must be chamfered so that it does not interfere with the boss.

Detail of front cross bar, front leg (half-lap joint), and support arm. The support arm is not quite fully in place, hence a small amount of the "tell tale" red paint is still visible.

Detail of rear cross bar, rear leg, and the rear of the support arm. Note that the head of the coach-bolt is very low profile, and much less likely to damage an arrow than a conventional hex-head bolt.

Several complete stands, note the safety cord which is not meant to be taut - the support arms define the exact angle.

Top half of stand, note how both front cross bars are flush to the front of the upright, but not to the rear, due to half-lap joints. In contrast, the rear cross bar is a simple "surface mount" joint so that it does not interfere with the support arms or the front legs, when the stand is folded.

Straw boss in place, note how the tell-tale red paint is not visible, and that the support arms are long enough to easily support a second boss if "pass throughs" are a problem.

General dimensions / scheme of parts.

Parts List, per stand

  1. CLS Timber, 63 x 38mm, 2400mm lengths, qty. 5.5
  2. Cup Square Bolts (Coachbolts) 10mm or 12mm x 90mm long, qty.4
  3. Penny Washers, to fit coachbolts, qty. 12
  4. Lock-nuts, Nylon insert, to fit coachbolts, qty.4
  5. Wood screws, 6mm x 90mm long, qty. 4
  6. Wood screws, 6mm x 60mm long, qty. 8
  7. Cord, rope or webbing; approx 1m but allow a little extra for the knots if using thick rope

Notes

Wrap shaft of bolt with approx. four layers of masking tape (approx six inches long), to match or exceed the size of the threads.
Use a fibre washer if possible, or glue two penny washers together, either way, get the widest washer available.
A small patch of red paint on the front of the front cross bar can provide a useful "Tell-tale" to indicate that the support arms are not fully in place.When the support arm is in place, draw a pencil line around the bottom of the support arm, on the front face of the front cross bar, then remove the support arm and paint almost up to pencil line. The same thing can be done on the sides of the support arm, where it would normally be inside the notch in the front cross bar. (The photos explain this better than I can.)