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| 75Plus:
I am in the process of restoring an old Rockwell/Delta drill press. I estimate that it was made in the late 50's or early 60's. The spindle shows signs of being mistreated and I would like to make a new one. Spares are unavailable. The part is 14" long and 5/8",(.625") There are two grooves, 5 3/4" long. 180 degrees apart, that appear to have been cut with a gear cutter designed for a 14.5 degree pressure angle. Each groove is approx. .152" deep. As I know nothing about gear cutting I am asking the EXPERTS ( I know there must be some here) for help. How do I do it at the least cost? This is what it looks like except the Jacobs #33 taper is not shown. |
| Bernd:
Your in luck 75Plus because my neighbor has one like that and I'm in the process of repairing the same spindle for him. I'm going to get a piece of cold rolled and mill two slots just using a small 4 fluted or 2 fluted end mill. I saw no reason for the shape of the slot in the original. In the original it looks like the spindle moved in a piec of cast metal. The two teath, if that' what you want to call them, were worn to the point of almost being square. By chance have you tried taking the top pulley's off? We couldn't figure out how that upper part is keep in. Almost looks like it could be a press fit. Bernd |
| dsquire:
Bernd I am not sure exactly what you mean but I had one that had a left hand thread involved. Just something else to check. :D :D Cheers :beer: Don |
| 75Plus:
Bernd, The drive sleeve on my machine is still in good shape. The teeth still have the original profile so I need to try to cut the grooves that way also. The top pulley is held on by a 3/8 24 cap screw tucked under the pulley in front. Removing the screw allows you to pull the pulley and bearing as a unit. Then there is three screws holding a plate that covers the bearing and holds the drive sleeve in. The bearing has an extended inner race that slips into the housing. That bearing is no longer available As for the one you are working on this may answer your questions. http://vintagemachinery.org/pubs/detail.aspx?id=903 This one may be a later model but all the parts still look the same. Joe |
| Lew_Merrick_PE:
Joe, If the slot looks like a 14.5° groove, it probably is. If you grind a (square or rectangular) lathe bit to a well symmetrical 14.5° taper (using an Acme thread gage), the "issue" becomes making it the proper width for the "bottom" of the groove. Add a couple of thou to the width at the (engagement end) of the mating part. Give yourself plenty (probably 10°-15°) side clearance and appropriate end clearance. Stone it up nice and sharp. Mount up the form ground lathe bit in a 90° boring bar (or homemade equivalent) and cut the groove very carefully. Use lots of cutting oil. Keep the feed as light as you can and still get a good chip. Watch everything carefully. Does that help? |
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