Announcement

Collapse
No announcement yet.

Planning and cutting half drop repeats

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • Planning and cutting half drop repeats

    Thank you Stitcher for this excellent explanation of maximising half drop repeat fabric.


    There are all sorts of strange calculations out there, most of which are very wasteful but here's a quick summary of what I do (Philip has just phoned and asked me to explain).

    There are two methods for calculating so first you need to decide which you need to use - this depends on the relationship between your required cut length and the pattern repeat. Let's assume for the purposes of this explanation that the fabric has a 60cm half drop repeat. Work out your ideal cuts (drop plus turnings).

    Method A - use this if your required cut is just over a whole number of repeats and up to an including a whole number and a half repeats - for example if your cuts are say 241cm to 270cm. The number of repeats per drop will always be 'something and a half'. Your fabric required calculation is (number of repeats per drop x number of drops) + 1. Example - your minimum required cut is 250cm - your drops will be 270cm which is 4.5 repeats. If you require 7 drops the calculation will be (4.5 x 7) +1 which is 32.5 repeats or 19.5 metres.

    Method B - use this if your required cut is just over a whole number and a half repeats and up to an including a whole number of repeats - for example if your cuts are say 271cm to 300cm. The number of repeats per drop will always be a whole number. Your fabric required calculation is (number of repeats per drop x number of drops) + 1. Example - your minimum required cut is 280cm - your drops will be 300cm which is 5 repeats. If you require 7 drops the calculation will be (5 x 7) +1 which is 36 repeats or 21.6 metres.

    Marking and cutting:

    Method A - decide on your ideal starting point on the fabric and mark with a pin (you have ordered an extra repeat to allow you to do this). Round your ideal cut up to the next half repeat - so if your ideal cut is 241cm round up to 270cm which is 4.5 repeats – you did this above when calculating the fabric required. Measure the 270cm / 4.5 repeats and mark with a pin (this is drop number 1). Measure the next 270cm from the pin (this is drop number 2). This will have a different starting point to drop number 1. Measure the next 270 from the last pin - this is drop number 3 and will be identical to drop number 1. Continue this way until all drops have been marked out (or cut if you are brave)- they will all be cut in order.

    Method B - decide on your ideal starting point and mark with a pin as above. Round your ideal cut up to the next full repeat - so if your ideal cut is 271cm round up to 300cm which is 5 repeats – you did this above when calculating the fabric required. Measure 300cm / 5 repeats and mark with a pin - this is drop number 1. Measure (and cut) another 5 repeats - this is drop number 3. Continue until all odd numbered drops have been cut. Now move down the fabric by half a repeat - this is wastage but it brings you to the starting point for all your even numbered drops. Mark another 5 repeats from the point you have marked which is drop number 2 and continue until all even numbered drops have been cut. With this method you shouldn't waste more than half a repeat when deciding on your starting point as you can always cut all the even numbered drops first.
    Louise


    sigpic Simply Sewing
Working...
X