B&D Motor Arbor Question - Router Forums
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post #1 of 14 (permalink) Old 12-26-2012, 04:49 PM Thread Starter
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Default B&D Motor Arbor Question

Here's a picture of an old B&D 7740 RAS (7740?)
(It's the same as mine so I liberated the online pic )
Does anyone have any specs for the back end of the arbor? My old manual doesn't even mention that it's internally threaded! Seems like it might have some use for driving a flex shaft? Other uses?
What about drill chucks for the 5/8" saw blade mtg. end? I seem to remember seeing references to it being a great starting point for a horizontal boring m/c ?
Excellent for boring into long timber....straight and level!
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post #2 of 14 (permalink) Old 12-26-2012, 06:36 PM Thread Starter
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From the B&D manual...
(see attached pic)
I'm a bit concerned about the motor speed; 3450RPM seems a bit aggressive for
boring holes in wood. From the parts diagram, it appears the arbour shaft is one-piece with no speed reduction capability. Maybe one of those electronic speed controllers might work in this application?
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post #3 of 14 (permalink) Old 12-26-2012, 08:03 PM
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Maybe one of those electronic speed controllers might work in this application?
No, they will not work with an induction motor!

I have found that hand tools are the best choice when I want to make mistakes at a slower rate of speed.

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post #4 of 14 (permalink) Old 12-27-2012, 03:04 AM
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Duane-
I would say 1/2" - 20 tpi... which is the same sized threads for a standard jacobs chuck.

That is also that same that is threaded as an auxillery on the Craftsman, PowerKraft and Dewalt... Which the Dewalt 7740 is the same animal. I heard that Black and Decker bought out Dewalt about the same time that model came out.

The auxillery shaft speeds on my PowerKraft RAS are 20,000 rpm and 1350 rpm. On The 1350 rpm shaft, I do sanding disks, grinding wheels, drill chuck with sanding drums, drill bits and a surface planer. My aux shafts and saw arbor are in a transmission, gear driven separate from the motor. The 20,000 rpm shaft, I do routing and shaper tooling.

On my Craftsman Electronic RAS, same sized thread. Like yours, that one is on the same shaft as the armature, which also is the opposite end from the blade arbor. Craftsman says you can do routing from that aux shaft... but I don't think the tooling quality is there at that low an rpm (1350 rpm). It's more like "carving" at that speed.

I keep finding more uses for my aux shafts. My PowerKraft RAS is probably the most versatile tool I have in my shop. I keep saying I'm going to sell it someday, but darn it, it keeps making itself indespensible. LOL.

Some of the oddity things for aux shaft use, there was a "saber saw" attachment... I didn't "get" the attraction nor see that as functional. Then there was a pulley attachment kind of "thing" that was used to belt-drive other tools.

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Last edited by MAFoElffen; 12-27-2012 at 03:17 AM.
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Duane-
I would say 1/2" - 20 tpi... Craftsman says you can do routing from that aux shaft... but I don't think the tooling quality is there at that low an rpm (1350 rpm). It's more like "carving" at that speed.

.
HI, MIke. You are quite correct, again! I bought an adapter for router bits for mine some 35 years ago. 3450 RPM just doesn't work that well with router bits(of course that was also with HSS bits at that time). Sent the adapter to a gent in the UK, a few months ago, who also has one of those 20,000 RPM spindles on his. He is quite happy with it.

I have found that hand tools are the best choice when I want to make mistakes at a slower rate of speed.

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post #6 of 14 (permalink) Old 12-27-2012, 12:06 PM Thread Starter
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Mike; I think you may have misdirected your reply...

Nowhere in B&D's manuals (or at least the ones I've been able to locate) do they detail the shaft specs. That attached picture was all I could find.
I'll pick up a couple of different sized 20TPI screws today and try them. If the shaft is 5/8" nominally then I'd have guessed that the internal thread on the other end couldn't be more than 1/4" -20TPI ? That's less than 3/16" of meat left on the shaft after having bored and tapped it (thickness of remaining cylinder wall)?
What're your thoughts on the 3450RPM shaft speed for accessory use?
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Mike; I think you may have misdirected your reply...

Nowhere in B&D's manuals (or at least the ones I've been able to locate) do they detail the shaft specs. That attached picture was all I could find.
I'll pick up a couple of different sized 20TPI screws today and try them. If the shaft is 5/8" nominally then I'd have guessed that the internal thread on the other end couldn't be more than 1/4" -20TPI ? That's less than 3/16" of meat left on the shaft after having bored and tapped it (thickness of remaining cylinder wall)?
What're your thoughts on the 3450RPM shaft speed for accessory use?
1/4"??? Internal thread? That would be quite different than the aux output shafts I'm used to. Let me do some looking.

"Don't worry, I saw this work in a cartoon once."
"Usually learning skills and tooling involves a progression of logical steps."

Last edited by MAFoElffen; 12-27-2012 at 01:31 PM.
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post #8 of 14 (permalink) Old 12-27-2012, 01:52 PM
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Strange. Didn't find anything on the Dewalt RAS forums, but their search only goes back 3 months. Did find this in someone's uploads:


bobj has a Dewalt RAS. He might know.

"Don't worry, I saw this work in a cartoon once."
"Usually learning skills and tooling involves a progression of logical steps."
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post #9 of 14 (permalink) Old 12-27-2012, 03:48 PM
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Hi

3450 rpm's is fine for drill bits,like they say run the drill bits at high speed when drilling wood and at low speed for drilling steel..

On one side of the saw (blade side) it's a 5/8-18 left hand nut and on the other end it can be 1/2-20 right hand thread or a 5/8-18 right hand thread they came both ways..some came with a 12,000 rpm gear box for the router setup on the right side...
Some set up for jig saw or router fixture with a 1/4" max shaft size..on the right side and some could be setup with the router on the blade once the blade was removed....

==

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..
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Strange. Didn't find anything on the Dewalt RAS forums, but their search only goes back 3 months. Did find this in someone's uploads:


bobj has a Dewalt RAS. He might know.



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post #10 of 14 (permalink) Old 12-27-2012, 03:49 PM Thread Starter
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I'll try and drag mine out of storage and get a better look at the arbour.
I trashed my L.H. rotator cuff back in Nov. and it's just getting worse...no way am I lifting my RAS up onto the workbench!
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