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Mark V Dust Collection - Is There a Better Way??

algale

dusty wrote It works well but it is not perfect. The current short coming is that the blade still brings some saw dust up above the table. This deficiency is corrected by the SharkGuard because it also collects topside but like I said, I prefer to not have all that regalia above the table. Furthermore, my DC3300 will not lift the saw dust high enough to go overhead with the hose.

What would really solve this dilemma for me would be to have a dust collector that resided in the space beneath the Mark V.

I've thought many times about buying a SharkGuard. I may still. But clearly some kind of bracket is needed to keep the upper hose out of the way, while not running the hose so high that the DC3300 can't keep pull sawdust up through it.

Not sure why putting the dust collector under the Mark V solves your dilemma.

JPG

algale wrote
dusty wrote It works well but it is not perfect. The current short coming is that the blade still brings some saw dust up above the table. This deficiency is corrected by the SharkGuard because it also collects topside but like I said, I prefer to not have all that regalia above the table. Furthermore, my DC3300 will not lift the saw dust high enough to go overhead with the hose.

What would really solve this dilemma for me would be to have a dust collector that resided in the space beneath the Mark V.
I've thought many times about buying a SharkGuard. I may still. But clearly some kind of bracket is needed to keep the upper hose out of the way, while not running the hose so high that the DC3300 can't keep pull sawdust up through it.

Not sure why putting the dust collector under the Mark V solves your dilemma.

Think small shop-vac! :D

algale

JPG wrote

Think small shop-vac! :D

Of course that's what I'm thinking but I'm embarrassed to admit that I still don't see what the advantage is to the subject under discussion.

dusty

algale wrote
JPG wrote

Think small shop-vac! :D
Of course that's what I'm thinking but I'm embarrassed to admit that I still don't see what the advantage is to the subject under discussion.

This thread has been like many others on this forum. The subject of the thread has changed. Now I do admit that the title leaves that statement open for discussion but if you read my initial comments/questions - I was looking for a more convenient way to connect the dust collextor hose to the Mark V and to route it to the dust collector. I was/am looking for a way to do this that is not compromised when either the carriage or the headstock are connected.

Now,having allowed myself to be redirected, if I connected two hoses to the lower saw guard and tee'd those into the DC3300, would I gain, lose, or retain air flow (330CFM).

I am actually digressing back to an attempt at doing this very thing several years ago.

Yes, I could spend bucks pipeing my garage and buying a big , powerful dust collector but is NOT GOING TO HAPPEN.

JPG

A small shop-vac provides greater static pressure(vacuum) that could 'pull' debris a greater vertical distance than the DC3300. Also a smaller hose would somewhat alleviate the above table clutter.

dusty

I am back working on an old concept; two dust collection points (one higher than the other) in the lower saw guard.

Preliminary tests indicate that "it works" but I have to make a lot of saw dust to know if it works any better than using just the normal setup. Success would be defined by "virtually no saw dust" above the table top.

With what I have right now, I could connect the ShopVac to one hose and the DC3300 to the other but that would not be my first choice.

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dusty

Nope! Still too much dust not being collected. However, this setup seems to put more saw dust topside. Topside being dusty indicates that the blade is carrying the dust up on the outfeed side through the ZCI. The collection system works fine except for that. The dust is from one (1) pass of that 2x through the blade

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dusty

I know I can do better than this.

I thought that maybe the topside dust was due to the fact that I was cutting very thin slivers off the work piece. Yup, ripping more reduces the topside dust but still does not pass muster.

I am thinking now that maybe my auxiliary port needs to be moved back (forward the outfeed side of the lower saw guard). This would having it collect dust just as the gullets approach the underside of the table.

Move the collection Point.

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BuckeyeDennis

Dusty, I have a wild and crazy idea for avoiding top-side dust collection. It just might work, probably isn't terribly practical.

Saw-blade gullets are designed to carry dust. Being that those gullets are flat-edged, I figure that some dust is going to want to ride in the gullet all the way through the dust-collector shroud and back up through the ZCI, where it is can come off top-side. The slipstream along the sides of the blade is probably pretty symmetrical, and passing through the ZCI on the upstroke may actually create turbulence that helps dislodge the remaing dust particles from the gullets. Your test results would seem to corroborate that theory.

The airflow in the shroud from the dust collector is pretty low velocity in comparison with the blade-edge speed, and I suspect that it does little to dislodge dust from the gullets.

So here's the idea. Instead of trying to suck the dust from the blade gullets, use an air jet to blow it out. Mount an air nozzle to the shroud such that the air jet is in line with the blade gullets, hook it to your compressor, and let it blast while sawing. It would probably be best to mount the air nozzle directly across from your DC port, so that the dust gets collected immediately, rather than swirling around in the shroud for a while.

Now personally, I think I'd rather deal with top-side collection hardware than listen to a noisy compressor. But it would be an interesting experiment.

dusty

algale wrote
JPG wrote

Think small shop-vac! :D
Of course that's what I'm thinking but I'm embarrassed to admit that I still don't see what the advantage is to the subject under discussion.

I'm not sure there is an advantage but but if it worked I could free my shop of that DC3300 which is noisy and consumes space.

dusty

BuckeyeDennis wroteDusty, I have a wild and crazy idea for avoiding top-side dust collection. It just might work, probably isn't terribly practical.

Saw-blade gullets are designed to carry dust. Being that those gullets are flat-edged, I figure that some dust is going to want to ride in the gullet all the way through the dust-collector shroud and back up through the ZCI, where it is can come off top-side. The slipstream along the sides of the blade is probably pretty symmetrical, and passing through the ZCI on the upstroke may actually create turbulence that helps dislodge the remaing dust particles from the gullets. Your test results would seem to corroborate that theory.

The airflow in the shroud from the dust collector is pretty low velocity in comparison with the blade-edge speed, and I suspect that it does little to dislodge dust from the gullets.

So here's the idea. Instead of trying to suck the dust from the blade gullets, use an air jet to blow it out. Mount an air nozzle to the shroud such that the air jet is in line with the blade gullets, hook it to your compressor, and let it blast while sawing. It would probably be best to mount the air nozzle directly across from your DC port, so that the dust gets collected immediately, rather than swirling around in the shroud for a while.

Now personally, I think I'd rather deal with top-side collection hardware than listen to a noisy compressor. But it would be an interesting experiment.

Definitely food for thought and I'm not sure that it would require the blast that an air compressor would produce.

Firechief2501

I am having a blinger of a time trying to find a lower saw guard for my Mark V. It had one when I bought it but Shopsmith came out with an upgrade for it and I bought it. However now I have found I do not have all the parts and Shopsmith no longer makes that upgrade. So if someone can find me a lower saw guard I would appreciate it. Please reply to Bill at billandkathy70@gmail.com. Thanks

chapmanruss

Firechief2501,

I'm not sure which Lower Saw Blade Guard you have but from your description I am guessing it is the later one for the Mark V 500 as shown in the PDF below. The PDF linked here is from this Shopsmith website.

https://shopsmith.com/wp-content/uploads/manuals/845197-FREE.pdf

Although the instructions are still available at the link above the Retro-fit Kit itself is no longer available.

Your best source would be the used market. Find one that looks like the one you have. Keep in mind there were several different Saw Blade Guard set made for the Mark 5/V with the original Table System aka 500.

Please remove the email address link in your post. Communications should be made via posts in these threads or directly to a member via private messages available to all Forum Members.

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