Cal Haines
Diamond
- Joined
- Sep 19, 2002
- Location
- Tucson, AZ
I’ve spent some time understanding how the feed-rod clutch on the round-dial 10EE works. I’m documenting it here in case it is of help to someone else down the line. Comments and corrections are encouraged. The clutch setup on my machine, built 11/1943, does not appear to match the parts pictures in the 1942 manual, so I don’t know the correct names for the parts; I’ll just try to use descriptive names.
Here’s a photo of the feed-rod clutch on my round dial 10EE:
On the left is the feed-rod output shaft, on the right is the feed-rod clutch collar. Inside the output shaft is a spring-loaded piston that bears on the left end of the feed-rod (not shown). Note the set screw visible in the root of the output shaft splines, in the center of the photo. When the clutch is assembled, the setscrew is inserted in the hole in the collar and serves to retain the collar on the output shaft. The collar is, in turn, connected to the left end of the feed-rod by a tapered pin.
In normal operation, the spring-loaded plunger inside the output shaft presses the feed-rod and collar to the right. The setscrew in the output shaft splines keeps the internal splines of the collar engaged with the left portion of the external splines on the output shaft. The engaged splines cause the feed-rod to rotate with the output shaft.
A movable stop collar (E5-15), located on the feed-rod between the clutch collar and the apron, can be positioned to disengage the feed-rod clutch at any point. When the apron moves left against the stop collar, the feed-rod and clutch collar are pushed to the left until the clutch splines disengage, stopping rotation of the feed-rod. If the carriage were moving left due to apron feed (as opposed to action of the leadscrew), the carriage will stop moving and the output shaft will spin freely inside the body of the clutch collar. Moving the carriage back to the right will allow the clutch to reengage. (This should, of course, be done after stopping the spindle.)
Should the feed-rod clutch ever disengage, it is likely to reengage such that the setscrew in the output shaft no longer lines up with the hole in the clutch collar. It will be necessary to disengage the clutch and rotate the collar to line up with the setscrew before the clutch can be disassembled. Referring to the photos, note the backwards C-shape mark on the output shaft, to the left of the setscrew. It is unknown if this is a witness mark intended to facilitate proper clocking of the clutch splines, or some other mark. In order to disassemble the feed-rod clutch, it is necessary to remove the casting that contains the bearing on the right end of the feed-rod.
Cal
Here’s a photo of the feed-rod clutch on my round dial 10EE:
On the left is the feed-rod output shaft, on the right is the feed-rod clutch collar. Inside the output shaft is a spring-loaded piston that bears on the left end of the feed-rod (not shown). Note the set screw visible in the root of the output shaft splines, in the center of the photo. When the clutch is assembled, the setscrew is inserted in the hole in the collar and serves to retain the collar on the output shaft. The collar is, in turn, connected to the left end of the feed-rod by a tapered pin.
In normal operation, the spring-loaded plunger inside the output shaft presses the feed-rod and collar to the right. The setscrew in the output shaft splines keeps the internal splines of the collar engaged with the left portion of the external splines on the output shaft. The engaged splines cause the feed-rod to rotate with the output shaft.
A movable stop collar (E5-15), located on the feed-rod between the clutch collar and the apron, can be positioned to disengage the feed-rod clutch at any point. When the apron moves left against the stop collar, the feed-rod and clutch collar are pushed to the left until the clutch splines disengage, stopping rotation of the feed-rod. If the carriage were moving left due to apron feed (as opposed to action of the leadscrew), the carriage will stop moving and the output shaft will spin freely inside the body of the clutch collar. Moving the carriage back to the right will allow the clutch to reengage. (This should, of course, be done after stopping the spindle.)
Should the feed-rod clutch ever disengage, it is likely to reengage such that the setscrew in the output shaft no longer lines up with the hole in the clutch collar. It will be necessary to disengage the clutch and rotate the collar to line up with the setscrew before the clutch can be disassembled. Referring to the photos, note the backwards C-shape mark on the output shaft, to the left of the setscrew. It is unknown if this is a witness mark intended to facilitate proper clocking of the clutch splines, or some other mark. In order to disassemble the feed-rod clutch, it is necessary to remove the casting that contains the bearing on the right end of the feed-rod.
Cal
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