Mittler Bros Machine & Tool 900 - Manual (Page 8)

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CORRECTED MATHEMATICAL FORMULA
FOR HYDRAULIC TUBING BENDER
WHEN USING INSTRUCTION VIDEO
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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