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Helpful Information and Technical Tips

Coffey Machinery prefers to take a consultative approach to selling.

We have posted some helpful videos, calculators, and technical tips under this section of our website.

Each question can be clicked on to expand the library.

Please let us know if you have any questions.

CLICK HERE to contact Coffey Machinery with questions or comments.

Free Online Learning

Many of our vendors are producing video content at no charge to you. We will post the links here, Click on VIDEO to take your directly there;

VIDEO Facebook Live Weinig Moulder Tips

VIDEO Holz-Her Facebook Live Edge Banding with PUR

VIDEO Weinig USA Facebook Live # 3 ServoLock Spindle Tool

VIDEO Weinig Facebook LIVE Event 4 PowerMat 1500 Quick Tool Change

VIDEO Holz-Her Facebook LIVE topic NIR Zero Glue Line edge bander technology

VIDEO LINK Weinig Facebook Live # 6 Tool Steel and profile grinding information

VIDEO Holz-Her Facebook Live #7 Vertical Panel Saw in auto mode

VIDEO Weinig Holz-Her Facebook Live #8 EnVision Parametric passage door

VIDEO Weinig Facebook Live # 9 HydroMat 3000 12 inch 300fpm moulder review

VIDEO Weinig Facebook Live # 10 RondaMat 960 profile grinder tips and tricks

VIDEO HolzHer Facebook Live Small Edge Banders

VIDEO HolzHer Facebook Live Evolution Vertical CNC milling knock down connector parts

VIDEO Weinig Facebook Live Dimter optimizing cross cut saw

VIDEO Facebook Live Holz-Her Entry Level Edge Bander

VIDEO Facebook Live Weinig Material Handling Division Rip Saw Feeder 35 boards per minute

VIDEO Weinig Moulder Master and R1000 CNC tool grinder Facebook Live Event

VIDEO HolzHer GluJet edge bander system on Facebook Live

VIDEO Holz-Her Zentrex Panel Saw Feature Laser Part Verification

VIDEO HOLZHER ZENTREX CNC BEAM SAW BI-DIRECTIONAL GROOVING PART 2

VIDEO Weinig HolzHer review of training and service available

VIDEO Holz_her Multi-Tool Technology for fast radius changeovers on your bander

VIDEO Timesaver Abrasive Belt Change 

VIDEO Timesaver Widebelt Sander Tracking Issues and Settings

Sandpaper Stock Removal

APPROXIMATE STOCK REMOVAL AND DEPTH OF SCRATCH FOR ABRASIVE SANDING

 

  • Abrasive belt stock removal maintaining average belt life still capable of removing previous grit scratch. These figures are based on using an approximate feed speed of 24 ft./min or 8 m/min.

 

          Grit             Stock Removal: Inches            Stock Removal: MM

         

            24                       .125  -  .150                     3.18  - 3.81

            36                       .095  -  .110                     2.47  - 2.86

            60                       .035  -  .045                     .91  - 1.17

            80                       .020  -  .030                     .52  -  .78

          100                       .015  -  .020                     .39  -  .52

          120                       .010  -  .015                     .26  -  .31

          150                       .006  -  .009                     .13  -  .21

          180                       .003  -  .005                     .10  -  .13

          220                       .002  -  .003                     .08  -  .10

 Depth of scratch created by abrasive belt:

 

          Grit                       Depth of Scratch “         Depth of scratch mm

         

            24                       .040  -  .050                     1     - 1.27

            36                       .028  -  .030                     .73  -  .78

            60                       .025  -  .022                     .57  -  .65

            80                       .015  -  .018                     .39  -  .47

          100                       .010  -  .012                     .26  -  .31

          120                       .008  -  .010                     .21  -  .26

          150                       .005  -  .006                     .13  -  .15

          180                       .004  -  .005                     .10  -  .13

          220                       .003  -  .004                     .08  -  .10

The above chart is only a reference guide since several other factors, such as belt wear, wood species, part width, etc, will affect these figures.

Solid Surface values vary widely depending on chemical content.

Example

Stock Removal:    1/32” or .031” @20 FPM in Oak

          60 / 30 / 10 Rule of thumb:                

          GRIT CAPABILITY                                        REQUIREMENT

          100X stock removal =  .025”                          .019”           

          150x stock removal =  .011”                          .009”

          180x stock removal =  .006”  (.0036” pad)   .003”

          Total stock removal:     .042” or .0396”      .031”

          *aggressive – lineal sanding statistic – cross grain will be visible on door

 Example 2 

Stock Removal:  1/64” or .015” @ 20 FPM in OAK 

         GRIT CAPABILITY                                REQUIREMENT

         2 Heads:

         120x stock removal = .018”                             .011”

         180x stock removal = .006” (.0036” pad)         .004”                      

TOTAL Stock Removal                                            .015”

         100x stock removal = .025”                            .011”

         150 x stock removal =.011”  (.006” pad)        .004”                           

TOTAL Stock Removal                                         .015”

          3 Heads: 

          120x stock removal = .018”                         .009”

          180x stock removal = .006”                            .0045”

          220x stock removal = .003”                            .0015”                          

TOTAL Stock Removal                                            .015”

 It is always better to sand less aggressively when sanding across the grain.

  • 3 heads will remove “depth of grit” scratch better than two following grit sequence.
  • 2 head Brilliant configurations “cut” better with less “force” effectively allowing grit “skipping”. i.e. 120grit to 180 grit with .015” stock removal on doors with one pass.
CNC Chip Load Calculation

Chip Load = Feed Rate (inches per minute) / (RPM x number of flutes)

Example: Chip Load = 500 inches per minutes / (15,000 RPM x 2 flutes) 

              Chip Load = . 017". 

1. Chip loads are based on material thickness of average size for cutting edge length of tool.

2. Generally speaking most tooling companies suggest no more than 3x's the diameter of tool for depth of cut. Material specific, please consult tooling manufacturer for exact specs. 

3. Careful consideration must be paid to material holding method (pods, jib, vacuum, mechanical), capability of machine (spindle HP, maximum movement speeds, rigidity of machine), and programming methods (through cutting, tabbing, onion skinning, lead in/out's, etc.).  Be safe and ask for help.

4. It is worth noting that the most common mistake we see in tool selection is buying a tool with more flutes than is needed and not being able to run the tool fast enough to allow it to perform. This burns up tools (likely more expensive) and is the equivalent to pressing the brake and gas pedals at the same time in your car.

Please contact Coffey Machinery if you have additional questions.