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Instructions for Using and Maintaining
DURSTON Rolling Mills Page 3 of 7
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INSTRUCTIONS
/ MAINTENANCE FOR HAND OPERATED ROLLING MILLS (cont.) |
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D4 158mm
- The D4 158 has an optional second lever ("D") which is used
for doubling the turning speed of the rolls. This second lever
is useful when you are rolling out the smaller jobs where not
so much effort is required, making the rolling quicker. For the
larger jobs the lower lever, ("C") which is located on the wire
roll, is the best to use as it gives you the maximum reduction
ratio on the gearbox.
- To change from the standard lever ("C") (lower lever on wire
roll) to the second lever. Remove the circlip on the wire roll
right hand side and the first lever will slide off. Now insert
the second lever ("D") into cover on the lower sheet roll ("E").
The two hardened dowels will locate into the gear. Now tighten
up the two 10mm bolts (17mm spanner).
- When turning with standard lever turn lever anti-clockwise.
When using second lever turn clockwise.
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Enlarged view off rollers
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Please note that the following is only a guide.
- Anneal the piece of sheet or ingot, pickle it, and rinse it
with clean water.
- Feed the metal into the mill, applying snug (but not overpowering)
pressure on rollers.
- After rolling metal through the mill, flip the piece end to
end before you roll it through again. You will get a more even
roll.
- Before passing the metal through the rollers, lower the rollers
until you have a snug fit (as in step 2).
- If the metal becomes to hard to roll, it must be annealed
again. Then roll the piece through the rollers, repeating as
necessary until the desired thickness is achieved.
- When rolling silver sheet it may be necessary to anneal the
sheet after rolling it from 3.0mm to 1.0mm in thickness.
For 14Kt gold the annealing may be necessary after rolling from
3.0mm to 2.0mm.
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Please note that the following is only a guide.
Reduce wire by rolling 2 or 3 times in each groove rotating the
wire 90 degrees on each pass.
Rolls should be closed for last pass before moving to next groove.
Depending on material, passes of up to 30% can be achieved.
The material should be annealed as often as necessary to avoid excessive
force when rolling. Indications of excess hardness are frayed edges,
wrinkling of surface, surface cracking or excessive force needed
to turn the rolls.
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