Electric Motors

[Philip RoweParticipant @philiprowe13116]

Bump. Can a Myford S7 owner comment on Raphael's question please? 'Very hot' in that area doesn't sound right to me. Bearing problem?

Dave

My 1974 S7 will get warm on this bearing after extended running, difficult to be precise but I would say only slightly above body temperature ie. can rest my hand on it without saying ouch!

Not very scientific but without further information it would seem that Raphael possibly does have a bearing or maybe an alignment issue here.

Phil

[Fowlers FuryParticipant @fowlersfury]

Raphael,
Running with a "slack" belt does have some value. It'll slip if your cut is too agressive and/or you get a dig-in thus reducing stress on your 1ph motor.
What oil are you using in the countershaft oil cups? Mine empty quite quickly when running & need regular topping up. The bearing though does not get hot to the touch.
Another useful and relatively inexpensive modification is to use a multi-link belt in place of the standard V belt. The lathe will run smoother and impose a bit less strain on the counter shaft.

[not done it yetParticipant @notdoneityet]

All belts have an efficiency during power transmission. I don’t know whether multi-link belts have a greater or lesser efficieny rating than V-belts. Of course, if one has a marginal surplus of motor power, every Watt can be important.

Raph’s motor appears to the wrong side of the energy equation as it seems to only flake out on longer running, under higher power. I fit linked-belts only when belt changing would otherwise entail a lot of extra work.

[Raphael GolezParticipant @raphaelgolez]

Thanks guys. I have slacken the belt tension and its a lot better. Done the whole morning running the S7 and it made a great improvement in the motor temp and the counter shaft bearing near the clutch. The oil consumption (i'm using the ones Myford recommended) on the counter shaft bearing near the clutch lever mechanism is way to much as compared to the left hand side, no idea why. The counter shaft bearings are ok and it has no play (i have disassemble it), the oil is feeding ok from the cup with no obstructions.

I will totally take the motor apart if I have the time and clean it as suggested.

Edited By RAPHAEL VAL GOLEZ 1 on 01/06/2018 14:48:51

[not done it yetParticipant @notdoneityet]

Difference in lube could be down to the oilers – swap them over to see if it is one side or one oiler?

But the other possibility of extra clearance on one side is the likely culprit. I would be checking more carefully if the problem stayed with the side on swapping the oilers.

[JonParticipant @jon]

Posted by SillyOldDuffer on 01/06/2018 08:13:20

Bump. Can a Myford S7 owner comment on Raphael's question please? 'Very hot' in that area doesn't sound right to me. Bearing problem?

Dave

Yes they will get hot within 20 mins giving it some.

Ralph good going on them if removing 1mm off diameter, had to put a 1ph 1hp motor on mine to do that, still got it with pulley.
It really struggled with anything larger than headstock bore and took an eternity to do the simplest of things even with the 1hp motor. Problem is the length of running time generating heat and wear, carry on at that rate 2hrs a night i'll give it till November before it needs a regrind and rebuild. Been there done it but did part own a precision grinding co at the time.

To give a beter idea i would be surprised if it took you sub 48 mins to do that menial 15mm to 12mm x 12" long with 4 passes. Heats generated but do have the better spindle and bearings on that one, mine would seize at 20 mins. Not only that lead screws and the like are under excess strain, if like me dont want to be there all night for simple jobs you would be better selling lathe as is before anything more derives putting the dosh to something more manly for same cost. Nothing to lose everything to gain.

[Alan pagetParticipant @alanpaget83187]

hello all I need some help I am looking for a small 12v electric motor that is strong enough to send some playing cards high up into the air I have some but there not strong enough need something powerful enough to do this any help would be great thank you

[Author]

Posts