DORSEY Benchmark 14HE User manual

Dorsey Metrology International
Optical Metrology Division
53 Oakley Street
Poughkeepsie, New York 12601
Telephone: [phone] Fax: [phone]
BENCHMARK 14HE/14H
OPERATORS MANUAL
Revised: July 2005

Section No..
Introduction 1. 0
Packing Details 2 . 0
Installation 3 . 0
Operating Conditions 3 . 1
Connecting Electrical Supply 3 . 2
Fitting Projector Lenses 3 . 3
Fitting Work holding Accessories 3 . 4
Safety 4 . 1
Operating 5 . 0
Switching On 5 . 1
Pre Run Checks 5 . 2
Focusing 5 . 3
Profile Projection Intensity 5 . 4
Surface Illumination 5 . 5
Manual Table Adjustment 5 . 6
Vertical Stage Adjustment 5 . 7
Angular Screen Measurement 5 . 8
Electronic Rotary Protractor 5 . 9
Maintenance 6 . 0
Cleaning the screen, lenses and mirror 6 . 1
Lamp replacement and adjustment 6 . 2
(profile & surface)
Fuse replacement 6 . 3
Accuracy checking 6 . 4
Lubrication 6 . 5
Technical Specifications 7 . 0
Benchmark 14HE System Checklist 8 . 0
Unpacking instructions 9 . 0
INDEX

The Benchmark 14HE Optical Projector is a compact bench
mounted unit with a horizontal lens axis and a single mirror
optical system,
The unit is designed to give the maximum possible screen size
and work stage capacity while retaining good operator access to
the controls and screen area.
The projector has a choice of lens magnifications from 10X to
100X, with quick change bayonet type fittings.
Fiber optic surface illumination is available as optional
equipment.
Please see our optical comparator sales catalog for further
information on options or contact your local sales
representative.
1.0 INTRODUCTION

2.0 PACKING DETAILS
The projector is normally supplied on a pallet with foam packing
protection, in a fiber board case.
For local deliveries the projector is sealed in plastic.
For deliveries overseas the projectors are sealed in plastic and
packed with desiccant.
Please ensure all loose items of equipment are identified and fully
unpacked before the packing material is discarded.
The projector must be lifted by the base. Under no circumstances
should the stage arm be used to lift or position the comparator.
Serious damage to the X axis mechanism will result if this cover is
mishandled.
Please ensure all lifting equipment used has been certified to
support a minimum of 250lbs/120Kg.
The work stage surface is covered with protective plastic and all
unprotected surfaces are coated with a oil based rust preventative.
This protection should be removed prior to use.
The projector stands on 4 leveling screws.

3.0 INSTALLATION
3 . 1 Operating Conditions
This precision optical instrument is designed to work in a normal workshop
environment but it is important to locate the unit as far as possible from
sources of grinding grit, oil mist, and vibrations. Where possible locate the
projector with the screen facing away from direct sunlight and overhead
lighting.
This unit should be placed on a strong sturdy bench capable of securely
supporting a minimum of 250lbs/120Kg. with a point pressure capability
minimum of 165psi. Dorsey Metrology International optionally supplies a
cabinet/stand designed for this application. Contact Dorsey Metrology
International or your local sales representative for information.
3 . 2 Connecting Electrical Supply
The standard Benchmark 14HE is supplied to accept 110-120VAC, 50-60
Hz main power. It may also be configured to accept either 220-240VAC, 50-
60HZ or 100VAC, 50-60Hz. Unless clearly labeled (next to the power input
plug) this unit is configured for 110-120VAC,50-60Hz. Listed below are wire
color codes
110-120 VAC system Brown/Black Hot
Blue/White Neutral
Green Ground
220-240 VAC system Brown/Black Hot 1
Blue/White Hot 2
Green Ground
Note this unit must be plugged into an outlet rated at a minimum of 15A
and must not be operated without an adequate ground connection.


3. INSTALLATION
3 . 3 FITTING PROJECTION LENSES
All lenses are supplied with quick change bayonet type mounts. To
mount the lens, install lens in lens barrel and rotate lens clockwise
until it clicks into place.
To install the lens: insert the lens with the
red dots aligned, rotate the lens clockwise
approximately 15 degrees to lock the
lens in place
3 . 4 Fitting work holding accessories
Work holding accessories available for the 14HE include combination
centers and vees, rotary vice and a vertical glass plate work holder for
the projection of small flat components.
All the accessories locate in the universal dove tail slot in the table
and are angular clamped in place with clamping screws. This type of
clamping accessory can be placed directly onto the table without
having to thread locating nuts in from the end of the table.
Dorsey Metrology International is also able to offer advice and
manufacturing facilities for special custom work-holding fixtures and or
trace units. Contact us for details.
Locking
points

4.0 SAFETY
This equipment has been designed and manufactured so far as is
reasonably practical to allow its safe operation when used in accordance
with the following instructions.
The equipment must be used in position that does not constitute a hazard,
where the operator and maintenance staff have free access to the control
and maintenance of the equipment, and are not subject to any external
hazards.
Services should be conducted by an authorized person, to approved safety
standards.
The electrical supply should be taken from a correctly rated source.
WARNING The equipment MUST NOT be operated without a secure
earth terminal connection.
Before connecting to a mains supply or attempting to use the equipment all
packaging must be removed including the transportation strap. Do not
connect or attempt to use any equipment showing obvious signs of damage
or deterioration and take extra care when switching on for the first time.
A responsible person should examine the equipment for operator safety
and determine the training requirement by the operator for its safe and
correct use.

5.0 OPERATING
5 . 1 Switching On
Ensure that the projector is connected to the power source as detailed in 3
.2.
The projector lamps are controlled by rocker switches on the lower right
hand side of the lamphousing. Separate switches control the profile and
surface illumination lamps. The profile lamp uses a 2 position switch: down
is low intensity, while up is high intensity.
NOTE: If equipped, Please refer to the separate operating instruction
manual for the various digital readout units available.
5 . 2 Pre-Run Checks
Ensure that the projector is secure on its stand or on a substantial bench.
Having selected a lens of the required magnification and locked it securely
in position, locate the component to be inspected in a suitable work
holding fixture which must be securely clamped to the table, the projector
is now ready for use, proceed as follows:
5 . 3 Focusing
Focus is achieved by rotating the small hand wheel on the right hand side
of the stage knee. The lens focal plane is approximately mid-way along
the focus traverse, central to the dovetail slot in the table.
5 . 4 Profile Projection Intensity
There are two profile light intensity levels, high or low, selected from the
rocker switch on the panel below the screen. Select the level that gives the
most comfortable viewing, according to the object projected and the
external lighting conditions prevailing.
Profile lighting is provided by a 24V 150W tungsten halogen lamp.
An iris diaphragm and or green filter is available as an optional extra which
may be fitted direct onto the lamp house to reduce the level of reflection
from brightly polished surfaces e.g. ground threads, etc.

5 . 5 Surface Illumination
Illumination of surface features on solid objects is achieved through the
use of high intensity LED optics.
For the brightest reflected image, place the light source as close as
possible to the face of the component to be inspected. Where components
have a directional surface finish, e.g. ground faces, the surface texture
should be placed at right angles to the table, this will give the brightest
reflected image on the screen.
5 . 6 Manual Table Adjustment
The X axis of the stage has a quick release for coarse motion. This feature
should not be used to move the stage during a measuring routine. Also,
when the quick release is engaged, the control knob of the X axis is
disabled.
To engage the quick release, rotate the lever to the furthest position to the
right. To re-engage the control knob rotate the lever to the furthest left
position. (see the picture below)
5. OPERATING
ON OFF

5. OPERATING
5 . 7 Vertical Stage Adjustment
Vertical adjustment of the work stage is by means of the large hand wheel
on the left below the work stage knee.
5 . 8 Screen Angular Measurement
The venire protractor screen, consists of a frosted glass screen divided
into four equal quadrants by precision cross lines. The screen is rotated by
means of a small hand wheel on the right of the screen. The standard
venire protractor can then be used to determine angles with 1 minute
resolution.