Gear Reducers

Gear Reducer



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Delta Dynamics Inc. is a member of the American Gear Manufacturers Association (AGMA), a voluntary association. AGMA is a member- and market-driven organization, conducting programs and providing services to the gear industry and its customers. AGMA is accredited by the American National Standards Institute (ANSI) to write all U.S. standards on gearing, and is committed and responsible for developing all international gearing standards.


Re-tech Arbor

Re-Tech Arbor

Delta Dynamics performs sawmill edger manufacturing, which is essential to the forestry industry. Sawmill edger manufacturing is much needed because using an edger can be extremely dangerous if it is not manufactured properly. That is why we manufacture parts that are high-quality and durable. Additionally, we are also able to make custom premium products, such as sawmill shafts and sawmill arbors. Having the correct size sawmill shaft is imperative for your sawmill and we can collaborate with you to find the measurements and create the piece you need. The sawmill shaft must rotate the sawmill arbor properly so that your machine will provide you with the results you desire. 


The Re-tech Style Arbor or Lobe Style Arbor is the most common drive used today. This is the first drive system used for driving the saw blade directly without the use of collars. The tooth form is based on what is practical for manufacturing, the saw eye can be formed with a punch or drill and the arbor can be easily cut on a milling machine with common stock cutters. The fit was designed comparatively loose to accommodate inaccuracies inherent to the manufacturing process. 
Current production methods, such as hobbing teeth on gear cutting machines, induction hardening and laser cutting, have allowed tighter fits to be achieved but the approach varies. The list below shows what were once considered standard dimensions. These dimensions have been modified both on the arbor and on the saw eye to reduce the clearance. The most common practice is to maintain tight tolerances on the arbor to standard sizes and to modify the saw to the fit required. New arbors supplied from most Original Equipment Manufacturers are supplied to the sizes given on the chart. Consult your saw supplier or Delta Dynamics to recommend what is practical for tolerances and best for your particular application. 
Benefits of Re-tech Arbors: 
· Manufactured from high tensile alloy steel 
· Cut on precision gear-hobbing equipment for indexing accuracy. 
· Available in sleeves or full arbors. 
· Induction hardened to minimize distortion. 
· Keyways timed to+.002 from center of tooth or space. 
· Sleeves supplied up to 22" long. 
· Outside diameters held to .002" tolerance. 
· Straightness held to .001" per foot of length. 
No manufacturer can ever claim that their design is the best on the market and superior to all others while maintaining its cost-effectiveness. In mechanical design there is always a tradeoff. To accomplish maximum saw eye stability, for example, the ability of the saw eye to shift on the fly must be minimized. To accomplish the best fits and tightest tolerances the cost to manufacture must increase. The ideal design is a balance between the required design parameters as well as the cost to achieve them. No arbor is best suited for all applications. Tell us what you need and Delta Dynamics will ensure that you receive the product that is best suited to your application. 


Drop In Replacement Gear Reducers

Steel Mill Galvanizing Line

These various-sized reducers were ordered to replace existing boxes which were no longer available. The bolt pattern on the OEM's new line of reducers rendered the old model obselete. Delta went on site, measured the existing boxes and manufactured new reducers to work with the existing mounting configuration.

Cooling Tower Drive

This reducer was ordered to replace a reducer discontinued by the OEM. The reducer was manufactured with case-hardened alloy steel gearing, 100,000 L10-life bearings, redundant acrylic seals and cast-iron housing with 4-point mounting to reduce noise and vibration.

Inline Reducer

The cast-iron housing of this Pulp & Paper Mill reducer was easily broken. Other mill machinery had been built around the reducer, preventing the use of a different reducer model. Delta built a new, welded steel housing with the old internal gearing. Brand new units were also supplied as the mill replaced all the old cast iron units. Reducer lifetime increased from 4.5 months to over 2 years.


A Continuous Splash lubrication system is used on most ratios and speeds for gear reducers. This reducer was built with a Forced Lubrication system, utilizing an oil pumps, filters, heat exchangers, sight gauges and an alarm system. Both systems greatly increase the longevity and power rating of the reducers.


An older model reducer that was very common in Pulp & Paper Mills was replaced by a new Delta Dynamics reducer with gearing made to AGMA standards. The service factor was more than doubled. Maintenance, noise and cost were all substantially reduced.

Gear Box Repair/Rebuild

Custom Gear Box Rebuilds

Delta Dynamics can build a new set of gears in an old housing, painted to your specifications with all new hardware and plumbing, without a "new" price. This box was rebuilt in less time than it would take to cast a new housing, and met all customer requirements.

A Tale of Two Rebuilds

This box was rebuilt and redesigned by another shop to handle the increased horse power that an Aluminum Smelter wanted to put through it. It lasted for 2 weeks.

The design looks good on paper, with large gear width being able to handle high horse power. However, large torque will wind up the pinion shaft so that the actual length of contact is nowhere near as wide as hoped.

Rebuilt Right

This set of gears was used to replace the failed helical set above. The double helical design eliminated all thrust loads on the bearings as the bearings were one of of the constricting factors with the increase in horse power. The gears were case hardened with profile ground teeth. The double helical design with an axial float on the pinion allowed full face contact regardless of tortional windage.

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