4. MSS Sanding PPT 2019 - Stiles Machinery

Industrial Sanding Solutions

What Is A Good Sanded Finish?

What is a good finish?

• Flat – Smooth• Correct thickness• No defects• Minimal fiber raise• No cross grain scratches• True final scratch• Ready for finishing

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Learn to read the panel!

What Is A Good Sanded Finish?

Who determines the desired finish?


Sanding Applications

Veneer

• Remove tape• Smooth surface• Remove oxididation• Handling marks• Reduce fiber raise• Prep for finish


Veneer Sanding Configuration


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Sanding Tools


Segmented pads

• Magnetic Coils• Dynamic• Float• Purpose

• Thin material• Veneer• Sealer

Sanding Tools


Crossbelt head – 120 Grit• Segmented• Purpose

• Removing tape• Shorten wood fiber• Smooth surface• Short grain sanding• Level solid wood edges• Polish sanding

Sanding Tools


Combination head – 150 Grit• Drum • Segmented pad • Purpose

• Flexibility

Sanding Tools


Chevron head – 180 Grit• Segmented pad• Purpose

• Best scratch• No chatter• Short scratch

Sanding Tools

Sanding direction matters


Quality Control


Veneer Sanding Audit Process• Pencil marks

• One head at a time• Touch

• Across grain• With grain

• Stain samplesCustomer samples• Record sanding method


5 Piece Doors• Calibrate

• Flatten• Dimension

• Finish Sand• Desired final scratch• Prep for orbit sanding


5 Piece Door Calibration Sanding Configuration


Sanding Tools


Contact drum heads• Steel - 100 grit• Rubber – 150 and 180 grit

• Durometer – shore hardness• Diameter

• Profiled drums• Purpose

• Stock removal• Short scratch• Chatter

Sanding Tools


Chevron head – 220 Grit• Air pad• Purpose


Sanding Sequence

When the abrasive hits the wood


Drum

DrumPad

PadPad

Drum

Skipping a Grit?

Quality Control

Calibration Sanding Audit• Story Board

• Head parallelism• Stock removal per grit


Proper grit sequencing

Poor grit sequencing

80 120 150 180

80 150 180

deep scratches not removedProper grit sequencing

Poor grit sequencing

80 120 150 180

80 150 180

deep scratches not removed


Edge Breaking First§ White wood

§ Coating coverage§ Eliminate white edges

§ Sealer sanding

Orbit Sand Second§ Cross grain removal§ Stain Obsorption§ Color match


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Edge Breaking and Cross Grain Removal


Sanding Tools


Orbital heads• Cross grain removal

Quality Control

Orbit Sanding Audit• Check cross grain removal• Light meter• Stain samples



Preparation between finish coats§ Cut down fiber raise§ Abrade the surface


Sealer Sanding Configuration


Sanding Tools


Chevron head – 400 Grit• Segmented pad• Variable cutting speed• Purpose


• Address melting

Quality Control

Sealer Sanding Audit• Even scratch pattern• No sand throughs• Smooth surface• Typical scratch for adhesion

• 320 or 400 grit



Texturing

Effects sanding


Proper Care and Storing of Abrasives

Storing• Humidity controlled enviroment• Hang belts 24 hours prior to use

Handling• Ease belts on to a machine

• Dents • Tears

• Do not slide across other belts


Sanded Surface

Preparation for finishing§ First step in finishing§ Waterdrop test

§ 24 – 48 hours§ Blotchy finishes§ Poor adhesion (glue bonds)


Common Sanding Defects


Stiles Machinery3965 44th St. SEGrand Rapids, MI 49512

www.stilesmachinery.com

Peter Van [email protected]

4. MSS Sanding PPT 2019 - Stiles Machinery

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