Ozbow

Hi all,

here's one I tillered out yesterday. It's Ironbark with a backing of bamboo, glued on with just over 2 inches of Perry Reflex, and maintains about ½ inch of reflex after unstringing.. The making of this bow was pretty quick: I used the templates for the bowmaking courses I run, so a lot of time was saved in laying out, and much of the tillering was already done. Fifty pounds draw force at 28 inches. Sixty nine inches tip to tip, just a thin hair under 38 mm wide at the widest, and just slightly narrowed at the handle.

In fact the whole process went very quickly, as a result of maths, engineering, templates, good materials and good tools.
Marking and cutting out: c. 15 min
Preparing bamboo: c. 15 min
Glue up: c. 15 min
(Glue time omitted, but in essence it consisted of leaving the ssembly in the car parked in the sun for most of a day. It was easily 60 degrees Celsius in there.)
Post gluing tidy up: c. 20 min
Tillering: 18 minutes
---Yep. Between putting the string on the first time and full draw was 18 minutes, and less than ½ Oz of wood came off.
Sand & wax: 50 min.
Total time (ex. glue set time): circa 2 hrs 20 minutes.

Full draw (of course): Overlays (experimental, I think thy turned out alright, could be a bit more accurate in the alignment): The Ironbark is very pale, but it still looks quite nice: Cheers,

Dave

As always a top result yeoman, Do I detect a Negative Tiller ? You'll start spirited discussion if you go and do things like that

regards Perry

Thanks Perry, I'm glad you like it.

There shouldn't be any positive or negative tiller. If there is its only incidental. The tips are deflected as evenly as I could muster for 18 minutes of tillering.

I'm certainly not hoping to open that can of worms.

Cheers,

Dave

Nice work Yeoman!At first I had the same thought as Perry but on closer examination I think it is the angle of camera shot as the tiller rod at riser is below a true horizontal in shot which then makes lower limb tip appear to be closer to an imaginary archer, so to speak.

perry wrote:......... Do I detect a Negative Tiller ?.........

yeoman wrote:..........There shouldn't be any positive or negative tiller. If there is its only incidental.........

Looks fairly close to zero tiller to my eye, there could be some change after shooting the bow in.
Well done,

Daryl.

Hi Daryl,

I was going to do something graphic like that, but couldn't bring myself to be bothered. Doesn't look too bad after all.

Cheers,

Dave

Aren't Angles tricky when viewed on a Screen ! I have no clue how to apply the black line as you have Daryl but it shows the Tiller perfectly.

regards Perry

Looks great Dave, you have really sorted out how to make them in very quick time for sure.

Cheers... Rod

perry wrote:Aren't Angles tricky when viewed on a Screen ......

When viewed in the vertical plain I find a braced or drawn bow more difficult when evaluating the tiller. For me the horizontal plain is a lot easier.

Perhaps, because our eyes are on a horizontal plain it is easier to pick variances to the left and right of centre.

perry wrote:........I have no clue how to apply the black line ...........

I used Microsoft Paint to edit Dave's original photo. Apart from drawing arcs you can remove annoying things like tiller sticks and strings. In fact there are a lot of editing and drawing tools in Microsoft Paint that you can use.
Daryl.

When viewed in the vertical plain I find a braced or drawn bow more difficult when evaluating the tiller. For me the horizontal plain is a lot easier.

Perhaps, because our eyes are on a horizontal plain it is easier to pick variances to the left and right of centre.

It's interesting you mention that Daryl. When I get to about half draw or a little further, I like to take a picture and examine it in the vertical plane. I agree it's easy to find asymmetries in the horizontal plane, but I find looking at it in the vertical plane easier to determine how close it is to the intended draw shape. I suspect this is because this is the orientation most commonly seen in archery.

Looks good mate