This Case Study Was Supplied to us by our client, the actual end user, because of the precision work Gear World Performed on the Falk Gear Reducer.
“All soft foot checks and alignment accuracy exceed the OEM requirements.”
Installation of Falk 525AB3-AS Reducer
On North Conveyor
Job Started 02-04-2019. |. Job Completed 02-15-2019
Reducer rebuilt by Gear World / Advanced Gear in Chicago, IL
Removal of previous Falk 525 reducer began on 10-12-2018 after a catastrophic failure upon
Repairs Performed by Advanced Gearbox ServicesAfter removal, unit was shipped to Gear World / Advanced Gearbox Services in Chicago for repairs. As can be seen below, the following work was performed on the gearbox.
Description: Falk 525 Reducer Rebuild and Recondition Gearbox.
Rebuild and Recondition Gearbox.
Manufactured a cooling fan blade brand new. Repaired the fan cover, and 4 Seal plates. Repair the worn areas of the bull gear shaft. Main Drive Housing area, weld, machine, line bore,
Installation of Falk 525AB3-AS Reducer
Job Started 02-04-2019 / Job Completed 02-15-2019
As can be seen in the following report, close attention was paid to detail, cleanliness, and accuracy. All soft foot checks and alignment accuracy exceed the OEM requirements. The Falk 525 Reducer was filled with the recommended ISO320 gear oil specified by Falk.
When
Preparation for Installation
When the rebuilt reducer arrived on 2-4-19, top cover was removed to add ISO320 gear oil. This also gives us the opportunity to take pictures of the gearbox interior. Below are pictures of the Gearbox when delivered to Facility. Note that the shafts were greased and stretch wrapped to prevent rust, complete interior of the gearbox was painted with Glyptal, and the mesh pattern of the ring and pinion was very close to
The pics below are of the base when the previous reducer was removed and after it was cleaned. As can be seen in the pics below, everything was cleaned, including both coupling hubs, prior to the initial setting of the reducer
The pictures below are of the rebuilt reducer bottom side. Gearbox underside was thoroughly cleaned before setting onto the base.
Falk 525 Reducer Soft Foot Checks
After the Falk 525 reducer was set into place, all attachment bolts were tightened. A dial indicator was set up and zeroed on a foot, the attachment bolt loosened, indicator movement was noted, and the appropriate shim was installed under that foot. This procedure was repeated for the 5 remaining attachment bolts until soft foot was eliminated at all 6 mounting points. See picture below.
Falk 525 Reducer Soft Foot Data
The amount of soft foot after installation for each attachment point of the main drive reducer is listed below.
Falk 525 Reducer Shim Data
The thickness and location of shims at each attachment point of the main drive reducer are listed below.
Falk 525 Output Shaft Face Readings
The pic below shows how face readings for the F12N Falk reducer were obtained on the output shaft for alignment. A set of feeler gauges were used and measured with a 1” micrometer. Face readings are in the illustration below.
Falk 525 Output Shaft Rim Readings
The pic below shows how rim readings for F12N were obtained on the output shaft for alignment. A dial indicator was attached to the reducer output shaft coupling by means of a chain clamp, readings are in the illustration below. The Top + Bottom readings should equal the Side + Side but they do not because of coupling eccentricity. But the alignment still exceeds excellent tolerances for a 34 RPM shaft. For information purposes, the Falk manual states that a straight edge alignment is satisfactory. We strive to be as close to zero as possible.
F12N Drive Motor Soft Foot Data
Due to damage to the previous drive motor, it was replaced with a rebuilt motor. This allowed us to perform a thorough cleaning of the base and motor underside. After setting in place, the main drive motor was checked for soft foot in the same manner as the main reducer using an indicator.
Soft foot readings for the main drive motor are in the illustration below.
F12N Drive Motor Alignment Data
The coupling alignment from the F12N main drive motor to the input shaft of the Falk 525 reducer was performed using a CSI 2140 Laser Alignment system. When alignment was complete, all tolerances were in the excellent category as seen by the star on the analyzer for a 1781 RPM shaft. (actual shaft speed is 1781 RPM)
The thickness and location of shims at each attachment point of the main drive motor are listed below.
F12N Drive Motor Alignment Data
Below is the CSI Alignment Report for the F12 North Conveyor Main Drive Motor to the Falk 525 Reducer. As can be seen at the bottom of the report, set 1 is where we started with the alignment and set 7 is at completion. Both vertical and horizontal planes fell in the excellent condition range.
Creep Drive Reducer Soft Foot Data
After alignment of the main drive motor, the creep drive reducer was checked for soft-foot in the same manner as the main reducer using an indicator.
Soft foot readings for the creep drive reducer are in the illustration below.
Creep Drive Reducer Alignment Data
The coupling alignment from the creep reducer to the 1stintermediate shaft of the main reducer was also performed using a CSI 2140 Laser Alignment system. When alignment was complete, all tolerances were in the excellent category on the analyzer for a 550 RPM shaft. (actual shaft speed is 523 RPM)
The thickness and location of shims at each bolt on the creep reducer are listed below.
Creep Drive Reducer Alignment Data
Below is the CSI Alignment Report for the F12 North Conveyor Creep Drive Reducer to the Falk 525 Reducer 1stIntermediate Shaft. As can be seen at the bottom of the report, set 1 is where we started with the alignment and set 10 is at completion. Both vertical and horizontal planes fell in the excellent condition range.
Creep Drive Motor Soft Foot Data
Next, the creep drive motor was checked for soft-foot in the same manner as the main reducer using an indicator.
Soft foot readings for the creep drive motor are in the illustration below.
Creep Drive Motor Alignment Data
The coupling alignment from the creep motor to the creep reducer was also performed with a CSI 2140 Laser Alignment system. When alignment was complete, all tolerances were in the excellent category on the analyzer for a 1770 RPM shaft. (actual shaft speed is 1770 RPM)
Creep Drive Motor Alignment Data
Below is the CSI Alignment Report for the F12 North Conveyor Creep Drive Motor to the Creep Drive Reducer. As can be seen at the bottom of the report, set 1 is where we started with the alignment and set 3 is at completion. Both vertical and horizontal planes fell in the excellent condition range.
F12 North Input Shaft Spectral Data
Falk Gearbox Input Shaft Spectral Data
F12 North Output Shaft Spectral Data
