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Mechanical Dynamometer Detailed differences:
Low Capacity: 10,000 lbs and under
Medium Capacity: 15,000-20,000 lbs
High Capacity: 30,000 lbs and above |
Model AP |
APxtreme |
| Price and Delivery |
Price Range |
$617-$4045 |
$713-$4463 |
Typical Delivery
|
In stock to 3 days |
3 days to 2 weeks |
| Factor of Safety |
Minimum ultimate factor of safety
|
varies from 3:1 to 5:1 depending on capacity |
5:1 in all capacities |
| Visual Identifiers |
Dial
|
Traditional Dillon dial face |
Gray APxtreme label attached |
Serial Plates
|
"D" precedes the S/N |
"PL" precedes the S/N. All S/N's above 500,000 |
| Size and Weight |
Low capacity headroom loss / instrument weight
|
12.5" / 9 lb |
same |
Medium capacity headroom loss / instrument weight
|
12.5" / 9 lb |
15.6" / 14 lb |
High capacity headroom loss / instrument weight
|
29" / 64 lb (30-50K) 48" / 266 lb (100K) |
26" / 60 lb (30-50K), 34" / 165 lb (100K) |
| Pressure bar details |
Pressure bar ends
|
Square |
Rounded |
Material for 500, 1000, 2000 lb pressure bars
|
7075-T651 Aluminum |
Certified & Traceable E4340 Aircraft Quality Steel |
Material for all other capacities
|
E4340 Aircraft Quality Steel |
Certified & Traceable E4340 Aircraft Quality Steel |
Pressure bar finish
|
Gray powdercoat paint |
Electroless nickle plating |
Bearings
|
Installed in pressure bar OR in shackles |
Installed in pressure bar only |
| Shackles |
Shackle type
|
Anchor or closed-ball teardrop style |
Exclusively anchor shackles |
Shackle spacers required
|
No |
On medium and high capacities |
| Non-destructive examinations and Proof Loads |
Non-destructive examinations
|
Batch examinations using dye penetrant or magnetic particle particle inspection (magnaflux) |
Every pressure bar is inspected using magnetic particle inspection (magnaflux) |
Proof Loads
|
Not certified
Prood load prior to magnaflux. |
Each pressure bar is subjected to 150% proof load prior to first calibration |
| Carry case / storage crate |
Carry case or crate in all capacities
|
No, optional in 10" low and medium capacities |
Yes |
Medium capacity case
|
Plastic case for 5", optinal steel for 10" |
Wood crate for both 5" and 10" dials |
| Certificates included |
Calibration certificate
|
General card signed and dated by operator (full curve of readings certificate is optional) |
Certificate showing 8-10 point curve of readings based on 3 runs. Signed & dated |
Certificate of conformance
|
No |
Yes |
| Options |
Klaxon alarm or auto control switch options
|
No |
Yes |
Newton capacities
|
No |
Yes |
Frequently Asked Questions
Why offer two models of mechanical dynamometers?
As the leader in dynamometers, Dillon has been asked by many large companies and government agencies to produce custom versions of the model AP to comply with their stringent requirements. Since many of the needs were similar, Dillon found that they could solve most of the special requests with a second product line, the APxtreme dynamometers.
Who are the typical APxtreme customers?
Dillon has sold enhanced versions of mechanical dynamometers to the naval shipyards for nuclear refueling operations, McDonald Douglas for assembly, GE for moving critical engines, the navy for checking tension in aircraft landing drag cables on aircraft carriers. They are suited for any customer that wants every assurance of integrity that modern technology allows, such as those in fright loading or heavy-duty material handling.
What are the actual differences between the APxtreme and AP dynamomters?
- The medium capacity APxtremes are a different design than the medium capacity AP dynamometers. They are longer, use larger shacles and include a wood crate instead of a carrying case
- The high capacity APxtremes are substantially shorter and lighter than the equivalent capacity of APs
- The APxtreme pressure bar is a bit different from the AP. It is optimized for the longest life, has rounded or chafered ends and is electroless nicklel-plated. It is thicker and heavier in the medium and high capacities
- Every APxtreme includes a certificate of conformance
- Newton capacities, the Klaxon alarm and control switch options are available only on the APxtreme
Do the two instruments have the same calibration?
The APxtreme includes a detailed calibration certificate with curve of readings based on three confirming runs. The AP will be supplied standard with a card signed and dated by the operator. A fully detailed certificate with curve of readins is available at extra charge, either at time of order or after the sale.
Isn't the factor of safety a sufficient indicator of safety worthiness?
The safety factor is the multiplier (times the instrument capacity) that indicates how much additional load the dynamometer can sustain without dropping the load. While this is a good measure of design strength, there are other factors that are equally important in load-supporting components. Design for fatique, specification of aircraft quality materials, nondestructive examination and proper corrosion protection are all essential to safety.
Prudent companies will physically test their designs. Unfortunately, not every company will verify that a component actually achieves the factor of safety of the original engineering design. Dillon has confirmed by destructive tests that the factor of safety has been met in all its load-bearing components. Also Dillon will only certify use of the material tested to manufacture all dynamometers. Dillon will not test with one material and manufacture with another.
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