844 N / 844 NH Intramess Mahr Federal Cylinder Bore Gages

844 N / 844 NH Intramess Mahr Federal Cylinder Bore Gages


The Mahr Federal adjustable cylinder bore gage kits have been built on the idea of precision measurement under tough shop conditions. Robust and easy to use, they provide a fast and accurate method for checking bores in most industrial environments and applications. When supplied withthe 1087 BR digital indicator they proved high resolution, fast response and simple use for the inexperienced operator with dynamic capabilities. Other features include:

  • Measuring the diameter, roundness and conical form of a bore as well as the distances of plane-parallel surfaces
  • Measuring head consists of a carbide tipped moving anvil and an interchangeable stationary anvil which has a hardened steel ball; alternatively a carbide ball is available
  • Transmission lever system transfers movement of the movable anvil to indicating instrument
  • The broad centering bridge ensures automatic centering in the bore
  • Insensitive to temperature due to both the shank and transfer rod being made from heat resistant *Invar steel
  • Highly resistant to wear due to the carbide tipped moving anvil
  • Constant measuring force due to built-in spring thus eliminating user influence
  • Universally applicable and extremely versatile as every instrument spans a broad measuring range, within this range it is quick and easy to adjust to any size
  • Measuring head, holder, extensions, right-angle attachments and depth stops are all part of this extensive modular system
  • Supplied with: Holder, measuring head, stationary anvil, wooden case, excludes an indicating instrument

*Invar steel has a particularly low expansion coefficient and thus makes the instrument totally insensitive to any kind of heat. Body heat from the user, increases in ambient temperature have no influence on the measuring results!

Measuring range (mm)

Measuring range (in)

Error limit Ge μm

Repeatability fw μm

Hysteresis fu μm

Order no* 844 N

Order no* 844 NH
CARBIDE

18 - 50 .7 - 2“ 2 0.5 2.5 4474000 4475000
35 - 100 1.4 - 4“ 2 0.5 2.5 4474001 4475001
100 - 250 4 - 10“ 2 0.5 2.5 4474002 4475002
250 - 400 10 - 16“ 3 1.5 3.5 4474003 4475003
400 - 800 16 - 32“ 3 1.5 3.5 4474004 4475004
250 - 800 10 - 32“ 3 1.5 3.5 4474005 4475005


Indication unit sold separately. Add a Mahr 4337162 indicator to complete the system or add your own 8mm shank indicator.  Contact us for details.

Features

  • ON/OFF/RESET (Set the display to zero)
  • mm/inch
  • Reversal of the counting direction
  • PRESET (Allows the entry of any value using set buttons)
  • TOL (Enter tolerance limit values)
  • Tolerance band max. 1.6 mm
  • START/STOP for searching the reversal point
  • MAX/MIN memory, ideal for searching the reversal point
  • ABS (Display can be set to zero, without losing the
    reference to the Preset value)
  • 0 (Set analog display to zero)
  • DATA (when connected with a data connection cable)
  • Immediate measurement due to the Reference system
  • Individual buttons can be locked -Lock Function
  • Operating and display unit (bezel) can be rotated 280°
  • High contrast LCD with 8.5 mm high digits
  • Inductive measuring system, battery life ca. 2000 hrs.
  • Maximum measuring speed 1.5 m/s (60”/s)
  • Sealed protection cap
  • MarConnect data output: choose USB, OPTO RS232C, Digimatic
  • Operating temperature 10 - 40°C
  • Class of protection IP42 in accordance to IEC 60529
  • Supplied with: Battery, operating instructions

With a 2 point inside measuring instrument the point of reversal is automatically determined through rocking back and forth.
The actual value is detected and stored by the MIN function and indicated in the display (3).

Readings  mm / inch  Display range mm / inch
0.001 / .00005”  ± 0.02 / ± .001“
0.002 / .0001” ± 0.04 / ± .002“
0.004 / .0005”  ± 0.08 / ± .01“
0.01 / .001” ± 0.2 / ± .02“

 


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