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RESTRICT GEAR SIZES
This feature allows you to prevent large gear wheels from being used in positions in the gear train where you know they will not fit.
Two methods are provided to do this, and you can apply either or both.
BASED ON GEAR SIZE
The simplest is to place a limit to the number of teeth on gear wheels in each position. This may be necessary when there is a casting or some other metal obstruction preventing a bigger wheel from being fitted. The user enters the maximum number of teeth permitted for that gear. If it is blank or zero, then there is no size restriction.
BASED ON GEAR SPACING
A more precise method is to take into account the two gears that are meshing and the spacing of their studs (axles or shafts) when set at their maximum spacing. During meshing the radius of the first gear plus the radius of the second gear in the pair should not be greater than the distance between the axle of the first gear and the axle of the second gear.
To be precise, we should calculate the radius as half the "pitch diameter" where the gears come into contact with each other. The pitch diameter is about half-way between the outer diameter and the diameter at the root of the teeth. However, the program calculates this from the number of teeth and the spacing of the teeth. Imperial machines usually use diametral pitch (DP), which is the number of teeth on a gear wheel divided by the pitch diameter. It has units of teeth per inch. Metric lathes generally use the modulus (Mod) which is the inverse of DP, but the units are in mm per tooth rather than inches. Once the program has the DP or modulus it can calculate the radius of each gear from the number of teeth it has. In fact, the number of teeth can be considered a substitute measure of diameter or radius.
To apply this method the user will need to measure the distance between the shafts when the banjo (quadrant) is moved to its maximum position.
The maximum distance between the two shafts is equal to the sum of the two radii and since the radii are related to the number of teeth, it can calculate the total number of teeth permitted on the two gears combined. The number of teeth on each of the two gears are added together. If this total exceeds the calculated maximum number of teeth, then we know the gears will not fit and the result is not displayed (restricted).
If during data input a measurements is zero, it will not be used to restrict results.
Maximum number of teeth permitted on the stud gear
(eg due to obstruction).
Maximum teeth on the stud gear
Maximum number of teeth permitted on compound gear 1
Maximum teeth permitted on compound gear 1
Maximum number of teeth permitted on compound gear 2.
Maximum teeth on compound gear 2
Maximum number of teeth permitted on leadscrew gear (LSG)
(eg due to obstruction).
Maximum teeth on LSG
RESTRICTIONS BASED ON MEASUREMENTS
AND THE DIAMETRIC PITCH (DP)
OF THE CHANGE GEARS
Enter Diametric Pitch (DP) of the change gears. (Units are inches per tooth).
Diametric Pitch (DP).
There is more detail about gears in a section called 'Modulus' or 'Diametral_Pitch'
Enter the maximum distance between the stud and compound gear 1 in inches.
This is used when there are one or two compound gears in the geartrain design (2A).
stud and compound gear 1.
Enter the maximum distance between the shafts of compound gear 2 and leadscrew gear LSG in inches.
This is only used when the number of compound gears is set to 1 in the geartrain design (2A).
compound gear 2 and LSG