Mittler Bros Machine & Tool 2500 - Manual (Page 7)

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CORRECTED MATHEMATICAL FORMULA
FOR HYDRAULIC TUBING BENDER
The following formula should be used to determine the start point for each required bend.
The example will be for a Double Bevel Bend
L1 = 26 25 degree angle
L2 = 15 65 degree angle
L3 = 39 65 degree angle
L4 = 15 25 degree angle
L5 = 26
Bend #1 Start Point:
L1 – ½ developed length (DL25) – ½ (Gain)
26” – ½ (3.064”) – ½ (.050)
26” – 1.532” - .025” = 24.448
Bend #2 Start Point:
L1 + L2 – Gain 1 – ½ (DL65) – ½ (Gain 2)
26 + 15 - .050 –1/2 (7.941) – ½ (.973”)
26 + 15 - .050 – 3.9705 - .48895 = 36.491
Bend #3 Start Point:
L1 + L2 + L3 – Gain 1 – Gain 2 – ½ (DL65) – ½ (Gain 3)
26 + 15 + 39 - .050” - .978 – ½(7.941) – ½ (.972”)
26 + 15 + 39 - .050” -.978 – 3.9705 - 0.486 = 74.515
Bend #4 Start Point:
L1 + L2 + L3 + L4 – Gain 1 – Gain 2 – Gain 3 – ½ (DL25) – ½ (Gain 4)
26 + 15 + 39 + 15 -.050 - .978 - .978 –1/2 (3.054) – ½ (0.497)
26 + 15 + 39 + 15 - .050 - .978 - .978 – 1.527 – 0.025 = 91.442
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