by ArtF » Thu Jan 23, 2014 2:24 pm
Paul:
As I figured, the actual specs of the 3mm are not easily found. The complexity of the specs is surprising in a gt2 , the 5mm for example
is speced at no fewer than 10 arcs with 12 intersection points specified. Much more complex than one would think. I dont like ot guess abotu such things
as it truly bothers me when someone counts on my numbers being proper and then finds they are not. (That costs people time and money and I DO
lose sleep over such things so I try very hard not to fudge unless its obvious to the fudger that he's explorin new territory. ).
If I may make a suggestion. I did some research as to the rate of change of the GT2 pulleys from size to size. As you go from 8mm to 5mm there is a
great amount of change in the radial sidewall nature, however, as you go from 5mm to 3mm that rate of change stops.. so I very much suspect
that if you were to put out a 5mm pulley of the correct tooth count and scaled it by the correct amount as a dxf, you'd have a 3mm pulley.
I cant really add such a loose spec without more testing, but were I needing a 3mm pulley, Id make a 5mm, and then scale it to the same OD as a same tooth count 3mm pulley. (Easy to find OD of pulleys online, its just the curvatures that difficult..)
Art
Paul:
As I figured, the actual specs of the 3mm are not easily found. The complexity of the specs is surprising in a gt2 , the 5mm for example
is speced at no fewer than 10 arcs with 12 intersection points specified. Much more complex than one would think. I dont like ot guess abotu such things
as it truly bothers me when someone counts on my numbers being proper and then finds they are not. (That costs people time and money and I DO
lose sleep over such things so I try very hard not to fudge unless its obvious to the fudger that he's explorin new territory. ).
If I may make a suggestion. I did some research as to the rate of change of the GT2 pulleys from size to size. As you go from 8mm to 5mm there is a
great amount of change in the radial sidewall nature, however, as you go from 5mm to 3mm that rate of change stops.. so I very much suspect
that if you were to put out a 5mm pulley of the correct tooth count and scaled it by the correct amount as a dxf, you'd have a 3mm pulley.
I cant really add such a loose spec without more testing, but were I needing a 3mm pulley, Id make a 5mm, and then scale it to the same OD as a same tooth count 3mm pulley. (Easy to find OD of pulleys online, its just the curvatures that difficult..)
Art