Morning,
Had customer call me up asking for a quote to modify a 40A 15 sprocket. Quantity is 50 pieces. Material is 1045 steel and black oxide finish. Supposedly only the teeth are hardened. Has a plain 1/2 center hole.
He wants a 3/4 inch hole with a keyway and two set screw holes 90 degrees from each other.
The OD of the sprockets are approximately 2.7 inches and are about .284 thick.
Opening up the hole to 3/4 inch and putting the keyway in seems straight forward enough. But I've never dealt with a thin sprocket. Especially without a hub. I'm concerned the hardening of the teeth extend down to the gullet where I will put the set screws.
How would you tackle this and what would you charge?
Had customer call me up asking for a quote to modify a 40A 15 sprocket. Quantity is 50 pieces. Material is 1045 steel and black oxide finish. Supposedly only the teeth are hardened. Has a plain 1/2 center hole.
He wants a 3/4 inch hole with a keyway and two set screw holes 90 degrees from each other.
The OD of the sprockets are approximately 2.7 inches and are about .284 thick.
Opening up the hole to 3/4 inch and putting the keyway in seems straight forward enough. But I've never dealt with a thin sprocket. Especially without a hub. I'm concerned the hardening of the teeth extend down to the gullet where I will put the set screws.
How would you tackle this and what would you charge?
in your shoes I'd allow for boring a set of (preferably full circle) soft jaws for boring the sprocket itself, .........I know from hard won experience, ''funny things'' can happen boring sprockets, and none of them good for accuracy.
