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Silver aluminium straight pencil grinder with rear exhaust and twist throttle

Dynabrade Products

Dynabrade Products 51706 Straight Pencil Grinder hand tool

SKU CH-BF7P-JVFVE

A straight pencil grinder with a 1/8 in collet, 35,000 RPM free speed and 0.1 hp motor for precision grinding

  • TypeAlignment Tools
  • Delivers precise material removal with 35,000 RPM free speed
  • Sustains performance under load at 8.0 CFM airflow
  • Reduces operator fatigue with 0.7 lb lightweight design
  • Fits tight workspaces with 5 1/4 in compact length
  • Ensures secure bit retention via 1/8 in collet capacity

What this grinder does

The Dynabrade 51706 is a straight pencil grinder built for precision deburring, finishing and light material removal in tight spaces. It runs on compressed air at 90 psi and reaches a free speed of 35,000 RPM with a 0.1 hp motor. The 1/8 inch collet accepts small carbide burrs and mounted points. Technicians in automotive, aerospace and mould shops use it where larger die grinders cannot fit.

Included hose and exhaust

A 60 inch whip hose with 1/4 inch inner diameter ships with the tool, so the operator can connect to a 1/4 inch NPT female air inlet without extra fittings. The rear exhaust directs airflow away from the workpiece, reducing dust blow-back on finished surfaces. Average air consumption is 2.0 CFM during a 15 second burst and 8.0 CFM at full load, which helps size the compressor and filter-regulator correctly.

Installation and common issues

Connect the whip hose to a clean, lubricated 90 psi supply using the 1/4 inch NPT inlet; the twist throttle then controls speed. The aluminum housing weighs 0.7 lb and measures 5 1/4 inches overall, so it balances well in one hand. Ball bearings require regular oiling through the airline; dry air causes premature wear. The fixed 1/8 inch collet cannot accept 1/4 inch shank accessories, limiting the tool to smaller cutters.

Highlights

  • Delivers precise material removal with 35,000 RPM free speed
  • Sustains performance under load at 8.0 CFM airflow
  • Reduces operator fatigue with 0.7 lb lightweight design
  • Fits tight workspaces with 5 1/4 in compact length
  • Ensures secure bit retention via 1/8 in collet capacity

Specifications

BrandDynabrade
TypeAlignment Tools

Questions about this item

How often will the ball bearings need grease or replacement on the 51706?

The ball bearings are sealed for the life of the tool; no scheduled greasing is required, and replacement is only necessary if abnormal vibration or noise develops.

What is the first limit reached when running the 51706 continuously at 35,000 RPM?

The 2.0 CFM average air consumption at 15-second intervals becomes the limiting factor, requiring a compressor that can sustain 8.0 CFM at full load to prevent speed drop.

How much noise and heat does the 51706 produce during all-day use at 90 psi?

Rear exhaust directs airflow away from the operator, reducing perceived noise, while the aluminum housing dissipates heat; the tool weighs 0.7 lb, minimising operator fatigue over long shifts.

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