heavy duty bandsaw
As is most things in woodworking it is a matter of measure twice and cut once. Remember that the left over sections of log can often be brought back to the bandsaw to made smaller bowls or squares. One of the great secrets in woodturning is the use of the bandsaw with its capability to make curved cuts easily and safely. In cutting green wood it is the use of a narrow band with wide spaced teeth that makes the cuts work. To get the best out of your bandsaw one must start with a properly adjusted blade guide blocks thrust bearings and a squared up table. It is very important to check each of these factors every time you use your saw change your blade or when your blade and blocks show some wear. A properly adjusted bandsaw is a delight to use. However if improperly adjusted it can be a major frustration. There are five simple steps one must perform in sequence to assure a properly tuned bandsaw. 1. Tension the Blade To do this you use the "blade tightening" knob that protrudes above the case of the top blade wheel. Some saws have indications for different blade widths.
However the mid-range bandsaw is more of a workhorse that can potentially re-saw up to its maximum capacity. Build quality is an important factor to look out for. Also think about the longevity and repair work. It is preferable to choose a machine that is capable of taking replacement parts by various manufacturers or you would be asking for trouble if spares are no longer available when the model is discontinued. Most 14" bandsaws have ground cast iron tables and many manufacturers now provide oversize rectangular tables. If your bandsaw comes with this table make sure it is accompanied by robust trunnions (table supports/mounting brackets) to compensate for the extra weight. Large sized bandsaws are for more professional woodworkers and are in the range of 17" 19" 21" and 24" models for the professional workshop. 17" bandsaws are popular due to the reasonable pricing. These machines will do fine curve work and are really suitable for resawing.
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This causes a band to start diving into the log in an uncontrolled manner. Remember that distortion is caused when a band is driven with a tooth load greater than the body steel is capable of withstanding and still return back to its original shape. Any bandsaw that is pushed to this point of stretch has become distorted. This will cause the band to not run good and it will dive into the log because of the natural change of curvature called anti-clastic curvature. Myth of restoring bandsaws debunked: When this happens the band cannot be restored to new by the Saw Repairman/Sawfiler. However the sawfiler can distort the middle of the back of the band to equal the front stretch/distortion. Of course for those who know the term this is called benching. This is when a roller or hammer is used to expand/distort the molecules to match the front distortion. The roller stretches the molecules by elongating them as it is pressed between two specially shaped steel rollers. The hammer expands the molecules in a star burst shape to achieve the distortion of making the middle of the band back longer. The hammer needs to be crowned to give a star burst expansion.
It is only when the prescribed amount is exceeded that it becomes distorted and loses strength. Think of valve springs in a gas/diesel engine. They operate within their ability to extend compress and return every time and run almost forever under harsh conditions. They do not exceed their steels ability to stretch and return. A good understanding of the above two paragraphs is very important to understand an accurate comparison between the swage tooth band and the set tooth that we will discuss below. Now let us look at a set tooth band of .042 thickness: The Kerf of a set tooth band is also two times the thickness. Usually .084 (sometimes more sometimes less). The difference is the set tooth shares the tooth load between 3 teeth. Each tooth is only .042 on the top or the leading edge. The most any tooth can cut is.042 wide. The average that the 3 teeth cut is only .028. The right and left tooth only cut the set amount beyond the body width. Only 2 of the teeth cut on the side and they only have 1 side to create side load which is very minimum. It is so small that I do not consider it to have a side load.