PC7518 in table router - Router Forums
 
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post #1 of 7 (permalink) Old 12-16-2012, 06:11 PM Thread Starter
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Default PC7518 in table router

I have a Porter Cable 7518 in a table router with a Woodpecker lift and exhaust port connected to a ShopVac. Is it recomended to shield the vented shaft end of the router motor from shavings getting into the PC7518 motor or does the normal air flow through the motor prevent shavings from entering the motor through the motor's shaft end vents?
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post #2 of 7 (permalink) Old 12-16-2012, 09:59 PM
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Welcome to the forum Paul. You don't want to interfere with the venting on the router. It is designed to run that way and altering the airflow could cause the router to overheat.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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post #3 of 7 (permalink) Old 12-17-2012, 12:57 AM
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Welcome to the forum, Paul.

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Last edited by jw2170; 12-17-2012 at 04:05 PM. Reason: correction
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post #4 of 7 (permalink) Old 12-17-2012, 09:56 AM Thread Starter
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Thanks Charles, that's the answer I was hoping to hear. My first job with new table router with PC7518 motor, Woodpecker lift, and Jessem table and fence used a 3 1/2" roundover bit so didn't use any tab-lock ring. A percentage of the shavings didn't get collected by the ShopVac attached to the 2 1/4" exhaust port of Jessem fence, the shavings dropped to the floor. But I didn't see any shaving accumulation over the vents of the shaft end of the PC7518 motor. I assumed the motor exhaust air was keeping the shaft end clear but was not certain. One can see the motor windings when looking through the shaft end vent and I didn't feel comfortable if shaving were to get into the motor housing.
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post #5 of 7 (permalink) Old 12-17-2012, 06:51 PM
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I'm not familiar with Jessem's dust pickup Paul. Is it on top or the bottom of the table? If the pickup is below the table that would be part of it. All of the shavings are being produced above the table and that is where the pickup should be. If it is above the table then it may be too narrow an opening to catch the dust being made at the outer edges of that large bit.

Both the router and router bits generate a lot of heat and need good airflow to stay cool. The vac probably helps in that regard. It will eventually suck in dust from the other end. There is no way to prevent this without interfering with the airflow. At some point, probably well down the road, it could prevent the windings from dissipating enough heat and lead to overheating failure. You could try the vac on suction and get some, and try using the exhaust as well to blow some out. I would ask a motor repair shop before using compressed air whether they think that is a good idea and how many psi to use.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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post #6 of 7 (permalink) Old 12-24-2012, 05:31 AM Thread Starter
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Thanks again Charles. The 2 1/4" exhaust port for the Jessem table/fence is in the fence above the table. Because of the 3 1/2" diameter of the roundover bit being used, I am not using a tab lock ring in the Woodpecker lift plate, and for safety with this large diameter bit, the PC7518 is being run at its lowest speed, 10,000 RPM. Thus the PC7518 motor shaft end has maximum exposure to shavings and minimum air flow to keep them out of the motor. I have not observed any shaving accumulation on top of the PC7518 shaft end after running a 4' long, 2" thick mahogany test piece so it appears the PC7518 exhaust is designed to handle this max exposure, min air flow situation. The ShopVac is sucking a percentage of the shavings but not all, there is a fair amount of shavings that accumulate on the floor. The 2 1/4" dia, 12' long, exhaust hose is routed downward after exiting the Jessem fence exhaust port enroute to the ShopVac to help the ShopVac keep up with the shavings but perhaps the 12' hose length may be excessive. However, I'm reluctant to cut the hose shorter unless there's a definite need. I don't mind the shavings on the floor, I just don't want them getting into the motor case.
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post #7 of 7 (permalink) Old 12-24-2012, 10:56 AM
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Paul, the dust pickup on my homemade table and fence are in the same spot yours is. I have a shop vac with a 1 1/4" hose hooked up to it and it captures better than 90% when I am using small bits. The only time I have used a large bit on it, a 1 1/4" round over- close to the same diameter as your bit, my wife was using my shop vac and I just let the chips fall where they may as the saying goes. I don't know if my pickup would have captured only a small % as you say yours did. I don't think that chopping your hose shorter will help very much. The force exerted on the chips is outward away from the router so I would keep on the way you are going and wait to see if it will become a problem. Maybe someone else will see this and have a suggestion to make your dust control more effective.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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