Cam gear broach accuracy
Cam gear broach accuracy
(OP)
Some time ago I ran into information on the problem issues of correct cam gear broaching. Seems to be a major problem that is not realized in the engine field. Apparently the broach pitch & depth is all over the map, so much so that a grade had been attached to the shafts & the good are few. There is a casting company that has invested in new equipment to correct this issue although I can't recall who they are. Their cam cores are very expensive in comparison to the jeneric cores too. This also applies to the dist drive gears. ------- What say thee?
John Haskell
Aire Research Engr.





RE: Cam gear broach accuracy
RE: Cam gear broach accuracy
RE: Cam gear broach accuracy
The keyway is usually indexed to a single tooth. Unless the index does not hold the gear consistantly or the broacher has slop, the keyway should be consistant.
Only the width of the keyway matters, not the depth.
Offset keys are available to fine tune the gear to cam relationship.
Whether they can grind all the cam lobes to the correct index is another matter. There you have to split the difference on all the lobes.
RE: Cam gear broach accuracy
These errors lead to vibration and wear.
Other processes like milling, broaching, plastic molding, or powder metal are used, and each would produce gears of a certain quality.
RE: Cam gear broach accuracy
John Haskell
Aire Research Engr.