Do you suspect a clutch problem? I don't understand how the clutch could exhibit the problems I am seeing. That being said, I will probably tear into it, because I don't see how anything else could be the problem (other than loose belts?).
When I first turn on my series 61 and engage the clutch, the spindle RPM is much slower than it should be. Over time, the RPM increases until it correct, but this could take more than a minute. RPM may ramp up more quickly if the clutch is disengaged and then reengaged. After the machine has...
This is a 6”, 4 jaw, light weight chuck fitted with a M46-3 back plate. I have been using it on a dividing head, but no longer need it. The chuck is in good condition and shows no appreciable wear or jaw damage. It does have a couple of roughly 1/16” holes drilled into the face of the chuck as...
If US steel was to be sold anyway, I am glad it went to Nippon rather than to some Chinese company. My hope is that Nippon invests the time, management, and money to make it a more efficient company that can grow rather than decline. I hope they invest in new equipment, processes, and...
I have often considered doing this to my lathe, but I have never been able to figure out how to do the full length of the bed. In every way I have considered, I could grind all but about 18" of the bed, but the sled would prevent me from grinding the portion under the sled and away from the...
A ~1950s vintage machineries handbook with have specs for a buttress threads. The NASA SRB holddown studs use buttress threads on the end that has an explosive separation nut.
Just buy a new one:
https://www.amazon.com/s?k=nelson+tractor+sprinkler&crid=1M0RUYUPB88EW&sprefix=sprinkler+tractor%2Caps%2C110&ref=nb_sb_ss_ts-doa-p_7_17
I have had several for more than 20 years.
I have new bearings now. I asked Monarch what the preload or torque spec was on the nut that preloads the inner races of the crossfeed screw bearings, and they said that there was none, that the preload was built into the bearing???
Does anyone have any idea about the preload or torque spec?
Yes, the work shows that the movement is real.
I think it is the bearings. I'll try 7001C bearings and see if it fixes the problem.
I have thought about the nut to screw interface, but I don't think that is the problem. I have used some pretty worn lathes without seeing that sort of problem...
The housing was broken on the closed end where the seal is mounted. I bored it out and put in a new part to retain the bearings and mount a more conventional seal. To the best of my ability, I have made the parts fit so that there is no play in the set of four bearings within the housing...
I tried 7001 bearings (30deg contact) without success, but it turns out that the original bearings New Departure 0L01 is a 15deg contact, so that makes them a 7001C bearing. I will try them and then tell you what I find. I would still like to get a bearing housing and used bearings.
Before you invest too much money, time, and labor, take a look at this:
https://www.practicalmachinist.com/forum/threads/metric-threading-on-a-1954-series-61-imperial-monarch.409966/
When I bought this lathe, the leadscrew bearings (Find # R20) were destroyed and the bearing housing (Find #s R22 and R23) was severely damaged. I have tried off the shelf bearings, and did my best to repair the housing, but nothing is keeping the crossslide from moving a few thousandths when...
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