CDM Systems, Inc. > The CDM Difference

The CDM Difference

The Experience to Build a Better Conveyor

We have amassed vast design and application knowledge over our 40 year history. We understand the affects chain pull, speed, torque, bulk density, and temperature can have on a conveyor’s performance. We know the layout configurations that will provide optimum performance and longevity. We engineer the detailed components into our conveyors that make inspection and maintenance easy over the lifetime of the conveyor. Like our chain, our conveyors are designed and built to last. Each conveyor we engineer will deliver the best performance at the lowest cost of ownership.

All CDM conveyors are engineered on a per-suit basis to ensure compatibility with the specific application. Our conveyors are manufactured to withstand the rigors of the harsh industrial applications they were designed to serve. We believe it is important to understand the true difference in a CDM system in design, materials of construction, quality of workmanship and QA/QC procedures.

The Three Most Important Components of the Conveyor are:




  1. Chain – The chain is the primary component within the conveyor and has to withstand the demands of the conveying requirements while providing reliable performance and long life. See the chemical analysis below.
  2. Housing – The casing must contain the material and resist abrasion. Our conveyor designs offer the best of both by providing:
    • Heavy A.R.S. Construction; typical materials of construction are 320-360 BHN sidewalls and 320-360 BHN bottom plates for abrasive applications
    • S.S. Construction for corrosive applications or a combination of materials for specific applications
    • Proper bolt spacing and gasketing of the troughs and stations
    • Access panels and inspection doors are effectively gasketed to ensure dust and weather tight construction
    • Using packing gland style shaft seals for very fine or fluid materials
    • Overlapping of bottom plates adds structural integrity and produces a joint that is straight and dust tight
  3. Drive and Terminal
    • Drive Station: Induction hardened segmental replaceable teeth, outboard pillow block bearings, packing gland seals when necessary
    • Terminal Station: Induction hardened segmental replaceable idler rims, outboard pillow spring loaded screw take-ups, packing glands seals when necessary


Chain Analysis Reveals Why Formula Matters

The data presented below are the results of an independent lab chemical analysis. The analysis was performed using 10 different industry available drag chains currently selling in the industrial market. Of the 10, we show 6 here because 4 were not even alloy steel making them an unequal comparison to the CDM Systems Chain Formula. The 6 manufacturer’s chain assemblies that use an alloy steel are shown below.

Micro Structure Testing of Various 142MM Pitch Chains

Micro-Structure CDM A B C D E
Identification Din. Desig.: 20MnCr5 18MnCrB5 20NiCrMo5 20MnCr5 20MnCr5 25CrMo4
Core Hardness (BHN): 300-400 300-400 300-400 415 300-400 355
Case Hardness (BHN): 550-650 550-650 550-600 535 500-550 550-650
Effective Depth of Case: .035 .022 .025 .010 .012 .055

The Chain Formulation Means the Difference Between Potential Catastrophic Failure and Operating Long-Term at Full Capacity

The most important feature of any drag chain formula is the effective case hardness depth. Once this case is worn through, elongation will accelerate and become a significant factor in maintenance. However, case depth is not unlimited and not the only factor in building a strong chain. The right formula or case hardness and ductility are critical. Too hard, as with a depth noted above of .055 and the ductility and impact resistance will be compromised and cause failures.