AndyMiller

Forfar is a long way for me 11hours too old for all night driving . If the cogs are operating correctly they smoothly mesh in and out share the load with the adjacent cogs. The problems arise when there is a shock load by a foreign body or broken cog. Quarter swan wood will split along the grain then they will start work loose and that when then trouble starts.

Hi Tiger Andy Thanks for replying, 3-4 year old is good the older the better, but your right Scotland is rather a long way, how far north in Scotland are you. The grain direction is to do with the cog withstanding unexpected impacts better when something accidently dropped into the gearing break a cog. Once on cog breaks several other will follow and even possibly damage the casting.

Hi Everyone I am looking for 45 to 50 mm thick air dried beech to make cog teeth, for a gear in a watermill in Herefordshire, see phot attached The cogs are made out of 115mm x 115 mm blocks that need to clean wood with no shakes, knots, spalting or sap wood. The grain needs to straight maximum 45 degrees, cogs with cross grain grater than this are liable to split. (see diagram attached below) I total in need make 170 cogs or 20 meters of usable wood. The cogs look like this:-