Ultra high amplification dial indicator breakdown.From left to right: dial face with bezel, friction free fully jeweled cartridge style movement and case with lapped chrome plated steel spindle and hardened steel stem.
Dorsey's high amplification dial indicators feature a shock proof "following" type jeweled movement, lightweight interior segmented precision gears and a two piece ring case for unparalleled accuracy and repeatability. Chrome plated hardened steel stem is virtually crush proof. All Dorsey ultra high amplification dial indicators utilize lever principle of motion. They do not rely on rack and pinion motion. This eliminates the inherent error between meshing of racks and gears. The illustration shows Dorsey's unique shock proof, high amplification dial indicator movement. Our dial indicators feature this lever principal and an adjustable eccentric cam to achieve unparalleled accuracy and repeatability.
Dorsey indicators are made in USA. These are probably the best American-made indicators available.- Long Island Indicator.
These dial indicators are duilt to American Gage Group 4 specifications. This group has largest diameter dial face that Dorsey offer. Group 4 dial indicators are ideal for any fixture gaging and where extreme accuracy is required. Ideal for quality labs, toolmakers and grinding areas. All group 4 indicators include flat back and standard steel ball contact point, part # 47011. Additional back options and contact points are available.
Group 3 dial indicators are recommended for fixture gaging or where space restrictions prevent the use of group 4 indicators. All indicators have flat back included and same contact point as group 4.
The group 2 dial indicators are generally considered to be the most desirable from a standpoint of versatility and standardization. In other application, where portability or cersatility is not an important factor, the higher magnification of the group 3 or 4 may be preferred. This is particularly true on bench stands and comparators and similar instruments.
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