Durston - Online Users Guide Page 4

Instructions for Using and Maintaining DURSTON Rolling Mills Page 4 of 7

INSTRUCTIONS / MAINTENANCE FOR HAND OPERATED ROLLING MILLS (cont.)

ROLLING MILL CARE AND TIPS

ALWAYS bolt down your rolling mill to a secure bench or secure stand for stability.
Ensure guards are in place at ALL times.
When the rolling mill is not in use, please apply a thin coating of oil to the rollers. Apply the oil across the rolls and turn them with the rolls nearly closed. This will spread the oil evenly across the surface. It is very important that your rolls are always protected especially in moist/wet/hot conditions or where temperatures are changing. Once your rolls are marked/rusty/corroded they will be like this for life until you have them removed and reground which can be avoided if they are looked after.
KEEP ROLLS CLEAN. Do not touch the rolls. Oils and acids from your body can damage the rolls leaving behind small marks and eventually rust.
DO NOT over tighten rolls together.
If possible use the centre of the roller. This will ensure even pressure on the rollers giving them a longer life.
DO NOT roll ferrous metals such as iron or steel through the mill.
ALWAYS release pressure on rollers after you have completed your job.
Do not lift the machine from the hand wheel.
To parallel the rolls remove circlip ("A") (black ring) at the bottom of the centre shaft. This is the shaft ("B") with the hand wheel. Lift the whole shaft out with the centre gear attached. Rotate either outer gear by 1 tooth in the correct direction (Please note that moving the outer gears clockwise will lower the roll and anti-clockwise will lift the roll), relative to the centre gear and replace the shaft with gear attached. As a test to see if rolls are parallel, roll out some material. If material exits to the right then rotate left gear clockwise by 1 tooth at a time until material exits in a straight line. If material exits to the left then rotate right gear anti-clockwise by 1 tooth at a time until material exits in a straight line.

Outer Gears

TROUBLESHOOTING

Problem	Cause	Solution
The edges of the metal is cracking	When the metal was poured , the ingot is not uniform in shape or the metal was rolled too much without annealing.	Remove the part of metal with the crack (by sawing), anneal, and then hammer out the metal around the the missing section until the edges are even. Anneal again and then re-roll.
The surface of the metal is flaking and/or cracking.	When the metal was poured, the ingot mold was cold -or- there may be too much old metal in the ingot -or- the ingot was annealed too much -or- there may be foreign material in the ingot.	Melt the ingot and reform it in the ingot mold. Roll it out again. If the problem persists, it may be necessary to refine the metal before you use it again.
When wire is rolled out, it is wavy or bent.	a) There was not enough tension applied to the free end of the wire. b) Too much pressure is being exerted by the rollers.	a) Hold the free end of the wire tight with one hand. b) Remove sheet, anneal it, plannish the distorted sections, and re-roll. Apply less pressure on the rollers.
When rolling sheet, it buckles.	Sheet was pushed through rollers after flipping end to end without annealing.	Remove sheet, anneal and re-roll.

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