Old DeWalt MBF to replace later one?

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Forum topic by MalcolmLaurel posted 04-15-2015 02:28 AM 744 views 0 times favorited 2 replies Add to Favorites Watch
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269 posts in 1043 days

04-15-2015 02:28 AM

Just saw a local CL ad for a 1959 vintage DeWalt MBF RAS. I have a much later 1980s vintage DeWalt 7749 RAS that my father gave me and has seen better days, and I the old power tools are often much more robust, castings vs. sheet metal and plastics, etc.. What I’m wondering is how much I’ll lose going from my current 10” saw to the 9” MBF? Or any other drawbacks of the older vs. the newer? I get the impression the old ones are more rigid and accurate. I know all the arguments re the pros and cons of a RAS vs a table saw and chop saw, suffice it to say the RAS is a perfect fit for the mix of odd jobs I use it for.

-- Malcolm Laurel -

2 replies so far

View derosa's profile


1568 posts in 2255 days

#1 posted 04-15-2015 02:42 AM

your 10” should just be able to cut a 2×4 on its side or a 4×4 in a single pass excepting miter cuts. My 770 has a 3.5” listed depth of cut and it has proven to just squeak it, a 9” blade will not do so. Since I like to use mine for a lot of cross cutting this does matter. The older saws may not have a blade break leaving the blade to spin for a long time after use. Only other thing would be availability of a wide range of blades, 10” has a lot available.

-- --Rev. Russ in NY-- A posse ad esse

View Fred Hargis's profile

Fred Hargis

3841 posts in 1913 days

#2 posted 04-15-2015 11:24 AM

You may get a better made saw, the older one will have a solid cast iron arm (your current one has that ladder box type arm, I think). It will also have a smaller motor (3/4 HP), and the 9” size. 9” blades are hard to find, but Freud makes the LU 91 in an 8.5” size which actually is a better choice with the smaller motor. The motor can handle most anything, but the cutting can get slow in thick, hard stock. As for the more rigid,accurate statement, B&D went on a cost engineering design with the later models like yours, the original ones had machined stops for the miters and 90ยบ position, and they can be tuned to be dead nuts. If it were me, I’d probably make the switch. I had an MBF for about 7 years before I found a 1030K (1.5HP, and 10”) to replace it. It wasn’t the 10” size that attracted me, but the larger motor. If you’re interested I can e mail a couple of pdf files on rebuilding/tuning the older Dewalts that provides an excellent tuning process. PM you e mail address if you want them. One other thing: if your current saw has a frame 236 motor, you might be able to put it on an MBF (or 925) yoke, and have the advantage the 11 amp motor on the older saw. I have a 925 set up like that now and the extra 1 amp makes a huge difference. Lastly, the mdf didn’t have a blade brake, but it does have some electrical reversing that helps slow the blade; with new bearings (important) my blade would spin down in 30 seconds.

-- Our village hasn't lost it's idiot, he was elected to congress.

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