|
Title: |
1914 Article-Stockbridge Machine Co., Knife Grinder |
|
Source: |
Machinery Magazine, V20, Mar 1914, pg. 608 |
|
Insert Date: |
2/20/2016 8:24:46 PM |
The time spent in removing and replacing the knives of planers and jointers used in wood-working shops constitutes a large part of the time involved when it is necessary to take them off for grinding. This is a difficult and unsatisfactory method, and is often done hurriedly and improperly, with the result that the machine when started up operates inefficiently and produces a poor grade of work. This is especially true of the thin hard knives used on cylindrical head planers which are almost impossible to grind and reset in perfect alignment for the entire length of the head.
In the “Quicsharp” grinder, which is a recent product of the Stockbridge Machine Co., Worcester, Mass, these difficulties are avoided by providing a grinder which enables the knives to be sharpened while in place on the machine. The grinder is motor-driven, the motor being mounted on the head and supplied with a current from an ordinary lamp socket. The saddle has a split nut attached to it which engages the feed-screw located at the top of the bridge. The saddle can be fed across the entire length of the bridge in either direction and at any desired speed. The bridge is supported at the ends or at intermediate points by two angular brackets, which are bolted to the bed of the wood-working machine and hold the grinder perfectly rigid. The wheel is cup-faced and can be raised or lowered by a thumb-screw to grind the required amount from the knives. The wheel is fed automatically to a positive stop. The grinder head is pivoted at the center and can be tilted to either side of the perpendicular; it is held in place against a stop, giving the same angle on each side of the perpendicular. With the head tilted, the knives are ground concave. A positive stop holds each knife in exactly the same relative position to the wheel; therefore, each knife must be ground true. Figs. 1 and 2 show this grinder in use on a planer and on a joiner and reference to these illustrations will show the way in which it is used, making further description unnecessary. |
|
1914 Stockbridge Machine Co., Knife Grinder (Fig. 1)
1914 Stockbridge Machine Co., Knife Grinder (Fig. 2)
|
|