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New 12-inch Miter Saw from Boschcomments (20) August 11th, 2010 in blogs
Correction: The maximum bevel angle for this saw is 47-deg, not 46 as described in the video.
Sliding miter saws are a mainstay of many home woodshops. The reason: their amazing crosscut capacity. This capacity is most-commonly achieved by one or more sliding tubes that provide the travel for the blade, transmission, and motor assembly. It’s a time-tested design, but there is a problem. The tubes usually stick out about 12 in. beyond the rear of the saw, requiring that the saw be positioned an equal distance away from the wall. As a result, you end up with two or three square feet of wasted space behind the saw—most woodworkers I know would rather put that space to better use.
Bosch has solved this problem with their newest 12-in. slider. Dubbed the GCM12SD, the new saw is like no other slider you’ve seen. It uses a pair of hinged arms each with three knuckles to provide the travel for its 13 1/2 in. crosscut capacity. The big benefit is you can put the saw right up to the wall. In addition, it’s very accurate because of the very tight tolerances in the slide mechanism’s hinge bearings. You can even adjust the slide resistance to your own personal preference.
|More on the Miter Saw
• Your Miter Saw Needs a Stand
• Choosing and Using a Miter Saw
• Build a Simple Miter Saw Stand
The saw bevels to 47 deg in both directions and miters to 60 deg. right and 52 deg. left. There are nine detents for common miter settings and the semicircular ring that houses the detent notches is adjustable for bringing the saw to square. Although we’ve seen it on past Bosch miter saws, I really like the upfront bevel control that eliminates reaching around the back of the saw for bevel adjustments. I tested the saw with a number of cuts and materials and it perfomed exceptionally well right out of the box. The cuts were smooth and the miters and bevels accurate. I did swap the Bosch blade that comes with the saw for a CMT version with 90 teeth because it had less runout than the factory blade. My only complaint with the saw is the adjustable depth stop designed for dados. It will yield slightly when you push down on the saw handle, which varies the depth of cut by .050 of an inch.
I was able to put a 45-deg miter on 3/4-in. thick by 6-in. wide stock standing up against the fence. With the stock lying down on the table, I was able to put a 45-deg. miter on 10 in.-wide, 3/4-in. thick stock. Bosch’s new saw is accurate, the controls are precise and intuitive, and the space-saving design is icing on the cake. Perhaps the only downside is the pricetag; it sells for $800.
The Bosch GCM12SD sliding compound miter saw is set for an October 1 launch. Look for it in stores within a few weeks after that official launch date.
posted in: blogs, Bosch, miter saw, compound miter saw, tubeless, knuckles, bevel adjustment
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New: Don’t miss posts by contributing editor Roland (aka Rollie) Johnson. Over the year’s Rollie’s tested countless tools for the magazine. His fascination with motors and gears goes beyond woodworking, he's also an enthusiastic hot-rodder who likes to restore old cars, and is the author of Automotive Woodworking (Motor Books International, 2002).