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General |
In order to inspect
the oilbath I removed the oilbath cover. (it was easy with my old lathe)
But this one was stuck, and after applying a little force it came off
tearing apart the oilseal. I don't know why it was stuck, maybe it was
due to old fat or glue/sealant from an earlier maintenance job.
In order to replace the seal, the headstock spindle has to be removed.
This was good opportunity to replace the belts also. The belts had a
little "wobble" due to a long period in which the lathe was
not used. The belts were probably comprimated at the contact point with
the pullys. It was also a good opportunity to inspect the rollerbearing
from the backgear-unit. |
Step
1 - preparing the main spindle |
Slacken the nuts from the
bronze bearing at the left innerside
Remove the cap at the backed of the spindle at the left outerside
Slacken the nuts of the main bearing on the right innerside
Remove the cap that holds the main spindle bearing on the right outerside
The seegering close to the uttermost left gear has to be taken out
of his groove.
Two pieces of wood have to be inserted to give a contraforce to the
primary bullgear of the backgear train. The elastical cords keep the
blocks in place
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Step
2 - removing the main spindle |
Tap the back of the main spindle. I used
some wood blocks but they could not quite stand the blowing forces of
the hammer. For the last blows I used a piece of bronze (this was due
to the bullgear at the right, this has a very tight fit around the spindle.
Put a rod inside the spindle, this will catch the loose parts and prevent
them form falling inside the housing. (I used a black tube as can be
seen in the left of the picture) |
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Carefully take each part off the rod and
rember (write down) their place in the following order and which way
they where mounted.
The V-belt is prevented from being removed by the second spindle of
the backgeartrain. Step three shows how this is to be removed. |
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This is the mainspindle. At the right side
the mainspindle bearings stay in place. |
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Step
3 - backgear axis disassembling |
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Turn the backgearselector in the upright
position. Then remove the handle knob. And the ring. |
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First remove the cap that holds the frontbearing
of the shaft. |
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Withdraw the handle shaft as far as possible |
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Drive the shaft out with a few gentle blows
against a piece of wood. |
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Take the backgearshaft out. |
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Step
4 - variatorpully disassembling |
Number the caps and bearingholders that come
off. |
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Step
5 - reassembling |
I replaced the roller bearing with a closed
type. They only do 6000 rpm instead off 10000 rpm off the open type. But
the lathe does only 1600 rpm so its quite sufficient. |
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Take great care off the alignment of the
splines and the keyways. Also take care of the oilsplash shimring near
the backend bearing.
The resetteling of the bull-gear takes quite a bit of force. In order
to guide the blowstrokes around the gears there need to be some pieces
of wood that support the pully. I used metalpieces, they deform the
rim of the headstock. |
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Step
6 - finished |
Here's the headstock completely reassembled |
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The variator belts are sized as the prescription
in the manual. But it seems to me that the size is to wide. |
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Here can be seen that the belt is running above
the top of the pully in close up. |
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