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9th April 2014, 08:03 PM #31.
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Bob,
I'd be lucky if there was 3mm clearance between the stator and the housing.
Reckon I'd know? Ha. No idea Stu.
This might sound excessive but I could part off the closed end of the housing and turn up a replacement. It appears only to have one feature, the bearing mount. Turning an internal register could be a bit of a challenge though once the outer end support, the spindle hole, is gone.
Bob.
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9th April 2014, 08:05 PM #32.
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Bob - What about bringing it along next Sunday?
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9th April 2014, 10:34 PM #33SENIOR MEMBER
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You could just upgrade to a better model.....
http://www.ebay.com.au/itm/Hercus-To...item3cdf2d007d
PDW
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10th April 2014, 01:01 AM #34.
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10th April 2014, 09:00 AM #35SENIOR MEMBER
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10th April 2014, 10:06 AM #36GOLD MEMBER
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I have just recalled how the motor rewinders did rewinds on large semi hermetic compressors where the stator was in the shell with no access at other end this was where the other bearing was fitted into part of the casing
Lots of heat ie 4-6 large oxy acet burners...not the 8,6 etc tips, those heating types applied to outside of motor casting.
all this was happening while the compressor was lifted by chain block with stator facing ground....heat and when ready hit the compressor with large small slegde type hammer and timber to prevent damage to casting, and stator falls out
I am talking about a stator that accepts a rotor of greater 400mm dia tho...wonder if this would work on yours?
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10th April 2014, 11:11 AM #37.
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I reckon I'd need to scale it down a touch! I'm wondering if my idea of a modification of the bearing puller so that it engages the narrow edge of the stator and a combination of hot air gun heat might do the trick Richard. The bore of the stator is only 50mm.
Another thing. I left the bit of string I intended using to re-tether the loosened windings at Bob's. I'm champing at the bit to see the grinder perform and Sunday's sort of too far away. Would the string they use for trussing meat be up to the task?
Bob.
edit. Forget the trussing. How about brickie's nylon string line ?Last edited by Anorak Bob; 10th April 2014 at 11:40 AM. Reason: Alternative added.
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10th April 2014, 11:34 AM #38.
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Any T&C no matter how good, is hamstrung without accessories IMO. That 3 of mine had an internal grinding spindle that ran out of true and a tailstock. About as useful as buying one shoe. Seeing and subsequently buying Peter's No.1 on the other hand with it's array of accessories was like finding El Dorado.
If anyone was looking at a Hercus T&C, the 3A would be a better acquisition than the older 3. The 3A's table runs on balls like the 1. The 3's table slides on V ways. The two older models are easily identified, the 3 has a large, 8" ish diameter handwheel for the table traverse. The 3A (and the 1) has a very small wheel for the same function.
BT
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10th April 2014, 12:20 PM #39SENIOR MEMBER
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Quite agree about the accessories; I never would have bought mine if it didn't come with a cabinet full including the cylindrical grinding head. I won't be parting with them unless I score a better set. Not sure what my friend with the No 1 has, I was more interested in other stuff at the time.
Mine is the original Model 3 with the V ways and large handwheel. The V ways are quite worn, I never did think much of the design and if you couple that with idiots who can't read and use grease in the oil nipples - not good. I could fix it, maybe even add linear rails etc, but I don't have the time.
Can't offer any suggestions WRT your small motor except, is it possible to replace it with another fractional HP 240V 3 phase one? I have 3 or 4 very low HP 3 phase motors in the pallet racks, not sure if they can be swapped to 240V though. They've all got worm reduction g/boxes on them.
PDW
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10th April 2014, 06:13 PM #40
When I was discussing connecting my lathe motor to the vfd with the local motor rewinder's, I was told
In regards to tape to re tie, you can use any twine/string/cotton webbing, you don't have to use high temp stuff, as the tape/string just holds the windings together, it has nothing to do with any the actual windings.
Dean
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10th April 2014, 06:26 PM #41.
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13th April 2014, 09:22 PM #42.
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More than a couple of tense moments!
I visited BobL again this afternoon and took along the workhead body with its pressed in stator. Bob had suggested knocking the stator out after heating the housing. On inspection he deemed that a risky procedure due to the probability of damage to the very fine windings. I took the thing home and partially parted then sawed off the end. I could not risk pulling the body out of the chuck, as it was I snapped off the narrow parting blade I started using.
I'll take a few close up shots of the windings tomorrow.
BT
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13th April 2014, 09:27 PM #43Distracted Member
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You did a nice job of guessing where to cut.
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13th April 2014, 09:52 PM #44.
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13th April 2014, 11:07 PM #45.
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Good job Bob,
Did you see the spaghetti we were looking at using the dentists mirror that looked like it had 3 wires coming out of it?
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