The Craftmans Shop > New from Old
Boxford back from the dead
AdeV:
--- Quote from: awemawson on June 19, 2019, 05:16:55 PM ---Dig a hole in the garden, surely Liverpool is on clay ?
--- End quote ---
I'm not in Liverpool, I'm in Birkenhead - which is mostly on used engine oil :lol:
AdeV:
--- Quote from: mattinker on June 19, 2019, 05:15:24 PM ---Artists suppliers should stock it!
--- End quote ---
Never thought of that - I was looking in toy shops :palm:
Fortunately, Amazon to the rescue, I've got 1/2kg landing at Lime St. Station tomorrow (in time for me to pick up on my way home after work), for the princely sum of £4. I could have had it for £2.85 if I wasn't so impatient... Had to buy a pack of 10 protractors to get next day delivery on them too :lol: Anyone want a protractor?
AdeV:
--- Quote from: Sea.dog on June 19, 2019, 08:00:03 AM ---14.5° gears have a rounded root whereas 20° is flatter, or is it the other way around? Whichever, you can see the difference between the two from both the root profile and tooth profile.
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I can't honestly see any significant difference between the two. It seems unlikely the one actually stamped 14.5PA is lying.... but one never knows. All the gears all seem to mesh with each other just fine... even the ones that aren't supposed to (e.g. the bull gear and the gear on the end of the pulley unit; or the pulley gear on the small end of the backgear shaft.
My backgear shaft has one damaged tooth... so it's tempting to cut a new one to 14.5PA, assuming that matches the bull gear of course.
Sea.dog:
At the end of the day, if you're using the back gear on a regular basis then you're going to wear both gears. If it's only ocassional use then you will probably get away with it.
Pete.:
Any gear you can lay flat on paper can be checked for pressure angle. Download Geardxf.exe which will generate a dxf based on your inputs. Generate gear drawings for both pressure angles. Now open the dxf's in a cad program and print them side by side it at 1:1.
Simply put your gear on the drawing and see which one it matches best.
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