THE YOUNG FARMER'S MANUAL. 427 



JOINTING A CIRCULAR SAW. 



652. If a circular saw is not as round as may be, the teeth on 

 one side will cut too deep at each revolution, and on the other 

 side will not cut as deep as they ought to cut ; and, therefore, at 

 every revolution one side will sometimes take such a rank hold 

 as to produce a jar, or spring the teeth, thus making a rough cut. 

 Some mechanics use for jointing circular saws, a kind of templet or 

 template, one end of which is rested on the collar of the mandrel. 

 But that is not as correct and easy for beginners as the manner 

 recommended at Par. 616. When a large circular saw is jointed 

 by being made to revolve backwards while a file is held against 

 the points, the impact or friction is so intense, that the teeth will 

 wear out a file wherever it touches the saw. When large teeth 

 need much jointing, hold a bar of lead near the points for every 

 one to touch as they pass it ; lead will not dull them : and then 

 file off the points of the long teeth until the facet made by the 

 jointing-file on the ends of them, will be even with the points of 

 the shortest teeth. Now, set it and file it. 



FILING CIRCULAR SAWS. 



653. The best and most convenient place for filing a circular 

 saw is on its mandrel, providing there is sufficient light to enable 

 one to see the points of the teeth. Some mechanics always take 

 the saw off the mandrel and put it in a vise when filing. But 

 any contrivance which will hold a saw firmly on the side which 

 is being filed is all that is necessary. I always have used for 

 this purpose two sticks, one on each side of the saw, extending 

 from the saw to some part of the frame. Every tooth should be 

 brought to the top of the saw when it is filed ; because any one 

 can file better on the top of a saw than on the sides of it. And, 

 if. every tooth is brought to just such a position before it is filed, 

 they are more likely to be filed alike. If the teeth are to be filed 

 square across, every tooth may be filed while standing on one side 

 of the saw ; but if the teeth are to be filed fleaming or bevel 

 ling, it is better to file the teeth on one side while standing on 



