Dorsey Metrology BC Universal ID/OD Bench Comparators

This comparator offers 2 or 3 point measurements for both ID and OD on one benchtop plate. Features include two or three point measurement, linear ball bushing movement and a wide range of adjustment. The fixture can be positioned at any angle from horizontal to vertical to duplicate the machining process angle eliminating deflection and deformation variation as potential sources of error.

Dorsey Metrology BC Universal ID/OD Bench Comparators Features:

Gage is supplied with model 2DM025-01 .0001" graduation 1:1 dial indicator
3 contact holders and BCC-GS25 contact set
Reversing the top plate selects either ID or OD
Base with carrying handle features 90 degrees of adjustment with angle locking mechanism
.400" linear gaging or retraction range
Patented precision linear ball bushing gaging mechanism
Witness lines aid with gage alignment
Ground and plated work stage 5.25" x 6.75" on BC1 and 9.75" x 10.75" on BC2
Includes fitted wooden storage case
2 Hex adjustment wrenches

Dorsey Metrology BC Universal ID/OD Bench Comparators:
BC1 Gaging fixture with 3 contacts, 3 holders and .0001″ grad. indicator

Model	ID Range	OD Range
“T” Configuration	ID Range .75″ – 4.44″	OD Range .25″ – 5.19″
“Y” Configuration	ID Range .75″ – 5.25″	OD Range .25″ – 6.00″

BC1-NI Same as above, less indicator
BC2 Gaging fixture with 3 contacts, 3 holders and .0001″ grad. indicator

ID Range	OD Range
“T” Configuration	ID Range 2″ – 8.44″	OD Range 1.5″ – 9.19″
“Y” Configuration	ID Range 2″ – 10.00″	OD Range 1.5″ – 10.89″

Special ratio 4:5 dial indicator or electronically compensated digital indicator is recommended for 3 point non-diametric contact arrangement. See table below for available models.

4:5 Ratio Indicators
Model Total Travel Graduation Revolutions Travel / Rev.

Model	Range
2DMR025-017	.02″ .0001″ 2.5 Rev. .008″
2DMR125-05Z	.100″ .0005″ 2.5 Rev. .040″
2DMR005-002mmZ	0.4mm 0.002mm 2.5 Rev. 0.16mm
2DMR5-01mmZ	4.0mm 0.01mm 5 Rev. 0.8mm
MT543-287B	.5″ / 12mm Selectable