Shopsmith Forums

I am cutting 1/2 inch deep 3/4 inch dados in some 2/4's. I read the complaints on the poor dust collection of the Shopsmith and have to agree it could be better!;)





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From the picture I would suspect your dust collector wasn't providing enough draw. I have had similar dust patterns when I forgot to turn on the dust collector.

If you dust collector is up to the job and was running then something that seems odd to me is the dust directly under the lower dust shield, how did it get there? I often end up with a real fine dust there that I assume is blown there by the air flow but your seems to have fairly heavy pieces laying on top of your carriage right under the dust shield. That suggests to me, 1. Either the dust shield is too widely spread that there is a gap or 2. The dust shield was closed in on the blade so tight the dust could get between it and the shield that mounts on the tie bar. I tried to see in the picture if I could see the tie bar shield and I can't tell if it is even there let alone whether the lower blade shield is adjusted over to it.

Lastly you are removing a lot of wood on this operation. I believe you have a Unisaw, so for a test can you duplicate the same process and see how much dust comes out of the Unisaw?

Ed in Tampa wrote:From the picture I would suspect your dust collector wasn't providing enough draw. I have had similar dust patterns when I forgot to turn on the dust collector.

If you dust collector is up to the job and was running then something that seems odd to me is the dust directly under the lower dust shield, how did it get there? I often end up with a real fine dust there that I assume is blown there by the air flow but your seems to have fairly heavy pieces laying on top of your carriage right under the dust shield. That suggests to me, 1. Either the dust shield is too widely spread that there is a gap or 2. The dust shield was closed in on the blade so tight the dust could get between it and the shield that mounts on the tie bar. I tried to see in the picture if I could see the tie bar shield and I can't tell if it is even there let alone whether the lower blade shield is adjusted over to it.

Lastly you are removing a lot of wood on this operation. I believe you have a Unisaw, so for a test can you duplicate the same process and see how much dust comes out of the Unisaw?

Maybe the DC has the wrong lettering on it(3letters)!;)

NIce thread and the pictures have brought up attention. I have simular situations and have not been able to figure out if it is normal or I was doing something wrong. I have always tried to adjust the dust cover over to the tie bar shield so there is no gap. Some have said that was not what should be done because there is to wide of an opening then between the dust port and the blade???? Never the less I get the same when I do dado cuts and have just figured it is normal??? I sure hope the old timers here can come up with what they do. I have a delta 650 cfm with 4in intake with 10 ft of 4" tubing to a 2.5" reducer and about 3 ft of 2.5" tubing to the SS. I plan on using 4" PVC to replace as much of the tubing as possible.

Adjusting the blade guard does not help. I had a Shopsmith dust collector and it did not work as well as this new 650 cfm Jet. An yes it was on the entire time I was cutting.


PS. The dust collection on my 20 year Unisaw sucks as well.

mbcabinetmaker wrote:Adjusting the blade guard does not help. I had a Shopsmith dust collector and it did not work as well as this new 650 cfm Jet. An yes it was on the entire time I was cutting.


PS. The dust collection on my 20 year Unisaw sucks as well.

I thought that was what they were suppose to do.Ha Ha:D I don't get that much, but do get a lot.

Good one Joe.

Let me clarify that I am not bashing SS or Delta just stating the obvious. It really does not bother me, I make a lot of messes worse than the SS does. I can see however how it would bother a lot of people working in tight places or attached garages.

Would a slower feed rate make a difference? I had a similar problem once with the planer. After I unclogged the hose and started taking a lighter cut at a slower feed rate, the problem was solved.

Gary

I have my Shopsmith dust collector hooked up to a run of 3" pvc pipe.
I get much better suction if I fully open one of the other ports than I do if I use just the port the hose is hooked to. My guess more airflow keeps wood chips moving.

cincinnati wrote:I have my Shopsmith dust collector hooked up to a run of 3" pvc pipe.
I get much better suction if I fully open one of the other ports than I do if I use just the port the hose is hooked to. My guess more airflow keeps wood chips moving.

The 'collector' must NOT be subjected to either limited flow(cf/m) or static pressure drop. Insufficient air into the intake will result in both dropping.

The smaller pipe results in higher velocity for a given flow(cf/m). The catch is that the smaller pipe results in a larger static pressure drop. If the static pressure drop can be kept low enough, a 3"(or smaller) pipe will 'work' better.

At the 'pickup point' a smaller diameter hose etc. is better since higher velocity results in better 'pickup'/'sucking it in'.