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Dewalt MMB18 RAS

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Forum topic by LucasWoods posted 12-29-2016 04:54 PM 404 views 0 times favorited 5 replies Add to Favorites Watch
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LucasWoods

332 posts in 1168 days


12-29-2016 04:54 PM

So my grandpa had this saw for a long time and now my dad has it and now I am looking at getting it as well.

The big question I have is it seems that RAS’s vary greatly in performance etc. I have read a lot of posts about people who say don’t bother with a RAS some say don’t bother with anything RAS unless it is xx brand before xx year…

Does anyone have any thoughts on the dewalt MMB 18? It looks like it is a pretty darn old saw.

This is what it looks like

http://www.vintagemachinery.org/photoindex/images/9478-A.jpg

-- Colorado Springs, CO


5 replies so far

View Fred Hargis's profile

Fred Hargis

4756 posts in 2328 days


#1 posted 12-29-2016 05:40 PM

Generally speaking, those who have had an experience with a craftsman RAS (probably the most popular one) did not get the results they were expecting (or promised). The design of the Craftsman saw was overly complicated and had parts prone to fail, particularly a yoke shaped piece that positioned the arm for perpendicular or angled cuts. Over time that yoke would spread apart and give the saw too much lash…it wouldn’t return to zero, or hold the setting. then there were the innumerable attachments that were supposed to make their RAS the only tool you need in a shop; most of which didn’t work worth a chit. On the other hand, the pure simplicity and rugged design of the Dewalt saws like the MMB (the ones with the cast iron arms) allowed them, once tuned, to do all manner of angled cuts and still return dead nuts to 90ยบ. They are an extremely useful tool and easily earn their keep. (not the phrase “once tuned”). If the MMB has a downside, it’s the somewhat under powered nature of that model. With a 1/2 HP motor (remember, these saws were made when HSS blades with a much thinner kerf were the norm) it will struggle on tough cuts. It’ still very usable, but you have to manage the feed rate and so on. Then there is always a debate about the safety of an RAS, with reports that the saw will climb up on the wood and rush at you. Nothing could be further from the truth…but you do need the proper blade and some caution just as you do with any other saw. At least that’s how I see it.

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

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Ripper70

608 posts in 743 days


#2 posted 12-29-2016 05:48 PM

If it’s in working condition, that’s a great tool. Definitely grab it and set it up. More info than you can imagine can be had here at this forum.

Look up information on building a Mr. Sawdust table and you’ll be on your way. Also, you’ll need a blade with a -5 degree hook angle.

If you have the serial # you can get an idea of the year of mfg. from the chart below.

-- "You know, I'm such a great driver, it's incomprehensible that they took my license away." --Vince Ricardo

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LucasWoods

332 posts in 1168 days


#3 posted 12-29-2016 06:00 PM

Serial number is 81233… so built in 1949… wow that is old haha

-- Colorado Springs, CO

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Ripper70

608 posts in 743 days


#4 posted 12-29-2016 06:44 PM

An oldie but a goodie!

-- "You know, I'm such a great driver, it's incomprehensible that they took my license away." --Vince Ricardo

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Fred Hargis

4756 posts in 2328 days


#5 posted 12-29-2016 07:33 PM

9” blades aren’t that common anymore, but you can get an excellent 8 1/2” Freud that just plain works well in those saws. Best part is they come wihthout that hideous red coating (my preference) at a reasonable price.

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

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