Dial Indicator: Difference between revisions

• A dial indicator is a tool used to measure linear displacements. It accomplishes so via the use of a plunger that's constricted to a measured linear movement. Simply, when the plunger is pushed into the body of the tool, the distance it is pushed in is "indicated" on the "dial" face of the tool. This is useful for any kind of precise measurement of thickness, depth, width, and can even be used to ensure a machining device or tool is accurately trammed.
• https://www.youmagine.com/designs/dial-indicator
• OSAT: https://www.appropedia.org/Open_Source_Appropriate_Technology

Bill of Materials[edit | edit source]

Part	Quantity	Source	Comments
PLA	~87 grams	Filament supplier of choice	Color of choice
Dial Indicator Body	1	Youmagine	Using PLA
Dial Indicator Top	1	Youmagine	Using PLA
Spacer	2	Youmagine	Using PLA
Dial Indicator Needle	1	Youmagine	Using PLA
Gear 1-2	1	Youmagine	Using PLA
Gear 3-4	1	Youmagine	Using PLA
Gear 5-6	1	Youmagine	Using PLA
Dial Indicator Plunger	1	Youmagine	Using PLA
Gear 7	1	Youmagine	Using PLA
6-32 Button Head Cap Screw 1 inch long	3
6-32 Button Head Cap Screw 1.25 inch long	1
6-32 Nylock Nut	4

Tools needed[edit | edit source]

1. MOST Delta RepRap or similar RepRap 3-D printer
2. Number 2 Phillip's Head Screw Driver
3. 1/4 inch Open End Wrench

TOOL REQUIREMENTS MAY VARY BASED ON NUT & BOLT SELECTION

Skills and knowledge needed[edit | edit source]

• 3D Printing Knowledge & Capabilities
• Understand the needs & application for a dial indicator
• Ability to assemble fasteners and critically aligned plastic components

Technical Specifications and Assembly Instructions[edit | edit source]

• Download and print the plastic components listed in the bill of materials
  • Recommended:
    • Material: PLA
    • Layer Height: 0.25 mm
    • Shell Thickness: 0.8 mm
    • Fill Density: 100%
    • Print Speed: 50 mm/s
    • Printing Temperature: 215 C
• Clean burrs and excess plastic from parts that may be remaining from print
• Align the corresponding components from the bill of materials to the pictures posted below while ensuring:
  • All holes align
  • All gears mesh together

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• Assemble Fasteners so that the head of the screws are on the face of the indicator
• Lightly tighten fasteners so that gears spin freely with minimal slop
• Assemble needle so that needle is spaced away from dial face
• Once completed, use a protractor to mark the face of the indicator in whichever scale is desired

Common Problems and Solutions[edit | edit source]

• If the gears don't align and interface properly, first ensure they are oriented with the proper gear in the proper location and proper orientation. Also ensure the layering of the gears is correct and in order. Another possibility is that the holes within the body and top components aren't lined up correctly.
• If the plunger is difficult to move: The indicator works best when the dial is rotated to move the plunger to it's location rather than using the plunger to rotate the high gear ratio.

Cost savings[edit | edit source]

• 87g of PLA ($1.57 USD) + Hardware ($1.58 USD) = $3.15 USD Total
• current one on the market: ($172.80 USD:https://www.mscdirect.com/browse/tnpla/86427457?cid=ppc-google-New+-+Measuring+%26+Inspecting+-+PLA_sW2Cu6rhf___164110844316_c_S&mkwid=sW2Cu6rhf%7Cdc&pcrid=164110844316&rd=k&product_id=86427457&gclid=EAIaIQobChMIyMap7rKV3wIVDAtpCh07fwOtEAQYBCABEgL5M_D_BwE/Current Market Indicator)
• Cost savings of $169.65 USD (1.82% of the cost)

Benefited Internet Communities[edit | edit source]

Name and add links to at least 5 using single brackets around [url name]:

• Appropedia OSAT Project for MY4777
• Grab Cad
• Practical Machinist
• Gitbug
• Thingiverse

References[edit | edit source]

• https://www.thingiverse.com/thing:873948/comments