For Models 41B and 42B machines
Lucas used several types and brands of electromagnetic clutches during the production run of these machines. Some clutches were non-adjustable (they were actually self-adjusting). These instructions ONLY apply to adjustable type clutches that are supplied DC electrical power by a 'slip-ring'.
Clutch Adjustment Instructions:
The Fawick type of clutch was the most common electric clutch used for High Speed in the headstock of Model 41B and 42B machines. Lucas altered the operating air gaps of the clutch after receipt from the clutch manufacturer. Here are the pertinent specifications.
There are 3 distinct types and 3 different sizes of mechanical clutches used for Feed and Rapid Traverse clutches on machine models 41B and 42B. The same clutch arrangement is used on certain other models as well and the same operational explanations apply to them.
Rewrite of Customer Service Bulletin No 568, originally dated 1-13-1966
Applies to: 41B2910 thru 41B3009
42B3606 thru 42B3708
and others with Magnetic Feed & Rapid Traverse Clutches
The subject machines have Mobil DTE-24 oil or its equivalent in the Speed Gearbox and Feed Distributing Bracket.
The following Twin Disk Clutch Replacement parts are available for Lucas Model 41 and Model 42 Feed Clutches.They are stocked as a complete 'kit' under Lucas Part Number 905811 and contain the following Twin Disk Parts: