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post #1 of 11 (permalink) Old 07-23-2010, 06:54 AM Thread Starter
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Default PC7518 speed question

Recently acquired a good condition (but used) PC 7518. Didnt realize it when I tested it before buying, but I notice that, on startup, it speeds up and then lowers speed shortly after.

Is this normal? I think it is......seems to me its getting up to max speed first and then lowering down to the correct speed setting on the unit. I havent verified that because I didnt want to take it up to 21K RPM with a large lock miter bit installed.

Anyone?

Thanks.

-Chris
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post #2 of 11 (permalink) Old 07-23-2010, 08:49 AM
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Hi Chris

That is the norm on some of the older models b/4 they added the soft start chip in the speed control device.

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Originally Posted by chrisexv6 View Post
Recently acquired a good condition (but used) PC 7518. Didnt realize it when I tested it before buying, but I notice that, on startup, it speeds up and then lowers speed shortly after.

Is this normal? I think it is......seems to me its getting up to max speed first and then lowering down to the correct speed setting on the unit. I havent verified that because I didnt want to take it up to 21K RPM with a large lock miter bit installed.

Anyone?

Thanks.

-Chris



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post #3 of 11 (permalink) Old 07-23-2010, 09:04 AM Thread Starter
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Thanks for the info.

Unfortunately, Im getting conflicting opinions another poster (not in this forum) said to expect power and speed issues. Yet another poster said theirs did this out of the box (brand new), so it makes me lean towards your explanation.

But its a little disconcerting, thats for sure!

I wonder if there is a way to tell if there is something really wrong with it ?

Thanks again though.
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post #4 of 11 (permalink) Old 07-23-2010, 09:14 AM
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Hi Chris

" I wonder if there is a way to tell if there is something really wrong with it ? " = Yes

You can take it by one of the many PC Service Centers and have them check it out and they will update the speed control if you want them to..

Technical Details

* Gets the toughest routing jobs done with a powerful 3-1/4 HP motor with five-speeds between 10,000 and 21,000 RPM
* Soft-starting feature reduces torque at start-up
* Aluminum motor housing and sealed ball bearing construction increase durability
* Measures 11 x 7 x 11 inches (LxWxH) and weighs 14-1/2 pounds
* Includes fixed base, 1/2-inch collet, collet wrenches, and operating manual


Amazon.com: Porter-Cable 7518 Speedmatic 15 Amp 3-1/4 HP Fixed Base 5-Speed Router: Home Improvement

I should note my son gave me two of the PC 7518, both where dead that they killed in his wood shop at work, took both to the service center for some TLC ,they gave me back one good one and one dead one back ,good for parts at a cost of 35.oo dollars for the TCL job,sold the bad one on eBay for parts only for 100.oo bucks ,I will say this is one router that's needs a lift kit if you are going to use it in a router table setup,it's a coffee pot looking tank of a router.. the adjustment ring fills up with router dust all the time.


===
======

Quote:
Originally Posted by chrisexv6 View Post
Thanks for the info.

Unfortunately, Im getting conflicting opinions another poster (not in this forum) said to expect power and speed issues. Yet another poster said theirs did this out of the box (brand new), so it makes me lean towards your explanation.

But its a little disconcerting, thats for sure!

I wonder if there is a way to tell if there is something really wrong with it ?

Thanks again though.



"It's fine to disagree with other members as long as you respect their opinions"

Marc Sommerfeld Tools ,Videos
http://www.youtube.com/channel/UCT-n...RWaEpMA/videos

Find all threads started by bobj3
http://www.routerforums.com/search.php?searchid=944097



Last edited by bobj3; 07-23-2010 at 12:33 PM.
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post #5 of 11 (permalink) Old 07-23-2010, 10:07 AM Thread Starter
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I might just have to try that.

I ran it at 21K RPM (full speed) and it started up and the speed didnt change at all. Im thinking it might just be normal.......go to full speed then back down to whatever speed is set.
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post #6 of 11 (permalink) Old 07-23-2010, 10:22 AM
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Chris,

I have a 7518 installed in my table and have spun bits from 1/8"OD to 3-1/2"OD (Marc Sommerfeld's big panel bit). My observation is similar to yours...

When I turn on the router, it fires up (relatively) slowly, goes a bit above the "set" speed and then slows to the right speed. When the bit is small it can go over the set speed quite a bit but when it has something resembling a load (i.e. a big bit to accelerate) it just goes over a little bit (10% or so). So, with it set to 10,000 rpm it might go to 11,000 rpms before slowing, but no where near 21,000 rpms.

BJ's right though. If it doubt, take it to the PC shop. A large piece of sharpened steel, spinning at 21,000 rpms, would be nothing to mess with.

Jim

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post #7 of 11 (permalink) Old 07-23-2010, 10:29 AM Thread Starter
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Thanks for the info.

I really have no reason to doubt it.....since the only other router I have is a DeWalt 618, the PC is "different". I guess I just wanted verification that it does occur normally. It makes enough sense to me.

I used it last night for some lock miter joints, and aside from the initial speed up then back down, it worked like Im used to (except with more power of course). I suppose if I updated to the newer speed control with soft-start it would be very similar to my DW618.

-Chris
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post #8 of 11 (permalink) Old 07-23-2010, 07:07 PM
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Chris, As BJ reported you can not beat the PC service centers. The 7518 is the most popular of the 3-1/4 hp routers. It has a long track record of good service. There are other routers available today that surpass it in features but they will never overtake it in sales.

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post #9 of 11 (permalink) Old 07-23-2010, 07:18 PM
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Quote:
Originally Posted by chrisexv6 View Post
Recently acquired a good condition (but used) PC 7518. Didnt realize it when I tested it before buying, but I notice that, on startup, it speeds up and then lowers speed shortly after.

Is this normal? I think it is......seems to me its getting up to max speed first and then lowering down to the correct speed setting on the unit. I havent verified that because I didnt want to take it up to 21K RPM with a large lock miter bit installed.

Anyone?

Thanks.

-Chris
that is normal i own 3 of this routers and the one with variable speed is the one that does that, when is set at lower speed, no worries
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post #10 of 11 (permalink) Old 01-04-2013, 10:30 AM
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I have started having the problem described by Chris after a couple of years of very good service in my table. Recently, however, it will initially speed up then slow down almost to a halt regardless of bit size. Could it be worn brushes? By the way, mine has a soft-start feature.
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