It has been noted by some that the Spindle locks do not need to be square cornered,or have as many teeth as we have on ours.
I would like to explain why ours are designed as they are.
Cast Iron as used in the head-stock housings is brittle. The Spindle Lock must transfer as much of the force used to loosen the chuck in the same (or as near as possible) to the direction of the base of the head-stock.
Any excess lateral force on the casting (ie. pushing out on the head-stock casting) will quickly find a weak spot if one exists.
As for the number of teeth that we have on our Locks, the closer the teeth at the top of the lock are to being at a 90 degree angle to the housing the better as it prevents the teeth from slipping out of the gears and pushing out on the casting.
The next issue is that they slide in from the front or rear of the bull gear.
A correctly fitting gear and lock is essentially a planetary gear system in which the diameter of the lock has to fit into the diameter of the bull gear gullet.
There are 3 ways to achieve this.
1. correctly size the lock to the gear and slide the lock in from the front or rear.
2. Make the lock flexible enough that it can be snapped in. (our Atlas 10/12 can be used that way due to head stock design) but that is the only one we feel comfortable doing that with but is not recommended.
3. Make them loose and with fewer teeth so the are able to be pushed in. (this leads to all the issues we try to avoid as described above.)SPL usage
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