Spring Loom – Lamms and Harness Bar Adjustment

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Spring Loom – Lamms and Harness Bar Adjustment

If you aren’t getting a perfect shed on your Spring loom, do some measurements and see if you need to make some tweaks to the adustment.

For this exercise, be sure to have the blocking pin inserted.   The texsolv has been premarked from the factory for the opening that the blocking pin should be placed. Place the blocking pin through the hole in the castle, through each marked texsolv space and through the exiting hold at the back of the castle.

These measurements are the recommended heights from the floor to the bottom of the lamm or harness bar. It’s best to use a metric ruler.  If you don’t have one, you can wrap a tape measure with centimeter markings around a yard stick wrapping rubber bands around the yardstick to keep the tape in place.

Lower lamm: 34cm  (about 13.39 inches)

Upper lamm: 53cm (about 20.87 inches)

Lower harness bar: 60cm  (about 23.62 inches)

Upper harness bar: 95cm (about 37.40 inches)

Place the yardstick on the floor, being careful to keep the yardstick “squared” with the loom (i.e. standing up straight, not leaning).   When looking at the measurement on each end, be careful to have you eye at the level of the measurement.  If you look at the measuring device from above it’s hard to get an accurate measurement.  If your loom is on carpet, be sure to press down on the yardstick.

When you do need to adjust, note that each hole in the texsolv represents 12mm (that’s 1.2 cm).  Also there’s a white nut on the side of the lamms and heddle bars that allow you to fine tune the adjustment;  screw the white nut clockwise and counterclockwise and observe how that lifts or lowers for the perfect adjustment.

When moving to another hole in the texsolv slip the plastic protrusion out of one hole and move up or down.  If this hurts your fingers try putting a thick piece of cloth over the plastic protrusion and use a tiny slotted end screwdriver to help guide the tesolv over and off the end of the plastic protrusion.

Check that each shaft is at the recommended heights.  Again, the measurement is from the floor to the bottom of the lamm or bar.

When you pull the blocking pin there should be a very gentle angle with the front shaft being a higher than the back shaft.  This is caused by the angle of the screws on the treadle and is to be expected.