SRH HINGE TEST RESULTS
|
TENSILE (extracts from lab tests) "The TENSION test was carried out using a ‘J.J.Instruments’ testing machine to pull the hinge apart via the clamped plates. Hinge failure was at approximately 2,080 N, due to fractures at the strap to plate spot welds." "The SHEAR test was carried out using a ‘Dartec’ testing machine to pull the two tubes apart along the length of the tubes. Hinge failure was at approximately 1,650 N, due to fractures at the strap to plate spot welds." SENSITIVITY (extracts from lab tests) "Each load receptor of the prototype weighing machine was loaded with 40kg and balanced as described previously. A load of 500mg was placed on one side, which caused the indicating needles to move by a viewable amount from their point of alignment. This can be equated to having a resolution of 1 part in 80,000 which for a mechanical assembly of this type compared to a weighing machine of similar design, is quite unique." "Owing to use of electronics in modern day weighing techniques, the hinge unit in its present form is impractible. However, where it could be advantageous in today’s weighing techniques is as a transfer mechanism from, for example, a weigh bridge bottom works to an electronic sensing device. In this instance only half the unit would be required with the need for only a single point transfer." DURABILITY (lab test results) |
Summary
of SRH Door Hinge Reversal Tests
(Carried
out in 1980s by Knight Strip Metals & Stirling Springs Ltd., Potters Bar,
Hertfordshire, UK)
|
Strap Specs |
Support Specs |
Additional Specs |
Degrees Rotation |
Cycles per min |
Reversals |
End Result |
|
.004" 302 Stainless Steel |
1.75" Dia Turned Steel |
Single 1.5" Bolt 40Kg Tension |
90 |
120 |
1,623 |
No Fail |
|
.004" 302 Stainless Steel |
1.75" Dia Steel |
Single Bolt/3" 40Kg Tension |
ditto |
ditto |
670 |
Edge Cracks X 2 |
|
.006" 302 Stainless Steel |
2.5" Dia Raw Aluminium |
ditto |
ditto |
ditto |
2,250 |
No Fail |
|
ditto |
ditto + 25Kg Load |
ditto |
ditto |
80 |
552 |
Edge Crack X 1 |
|
ditto |
2.5" Dia Raw Aluminium |
ditto |
ditto |
ditto |
2,785 |
Centre Crack X 1 |
|
.008" 302 Stainless Steel |
ditto |
ditto |
ditto |
ditto |
160 |
Centre Crack X 2 |
|
.006" 302 Stainless Steel |
2.36" Dia Alu D-section |
Self Tap Fixing Torqued 40Kg |
ditto |
100 |
362 |
General Cracks X 2 |
|
ditto |
ditto |
ditto + Increase Tension |
ditto |
ditto |
--- |
Extrusion Distorted |
|
ditto |
2.36" Dia Alu Extrusion |
ditto |
60 |
ditto |
201 |
General Cracks X 4 |
|
ditto |
ditto + Strengthened |
ditto |
ditto |
ditto |
300 |
General Cracks X 2 |
|
ditto |
ditto |
Spring washers + Lower tension |
ditto |
ditto |
2,500 |
No Fail |
|
.005" 302 Stainless Steel |
2.16" Dia Alu Extrusion |
ditto + 50K Door |
90 |
60 |
3,641 |
No Fail |
(Final Result: 3,641,000 Maintainance-Free Reversals)