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Nigel Bennett06/10/2008 00:15:00
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153 forum posts
38 photos
Hi Dauid today I have been using my router today with the extension in place and have been pleased with the performance. Though the largest cutter I have used so far is a 20 mm . 
Dauid Kent06/10/2008 09:16:00
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217 forum posts
1 photos
hi Nigel  i tried my cmt extension and seems ok with pannel cutter in on slow rev it must be record cheap one or just me ,
Nigel Bennett06/10/2008 22:50:00
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153 forum posts
38 photos
http://www.getwoodworking.com/sites/5/images/member_albums/7965/Router-extension.jpg

Hi Dauid meant to include a picture with my post

http://www.getwoodworking.com/sites/5/images/member_albums/7965/Router-fence-1_0.jpg


,dou!

Andy Bell07/10/2008 22:45:00
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156 forum posts
43 photos

Nigel, I think you could be one of the lucky ones. I had mine in the table and held a stick against the sides of the extension at low speed it hums. At high speed (no stick) it sets up a resonance, with a 20mm cutter in mine at anything over speed three the table starts vibrating and a bit faster and it gets scarey.

Time to order a new one. Any recomendations?

Andy

Nigel Bennett07/10/2008 23:26:00
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153 forum posts
38 photos

Hi Andy the extension is from Trend. What make is your Router? How good are the head bearings? Any movement? My first router was a B&Q MCallister,seemed good value ,it was crap! bearings in head stock had too much free play and  as a consequence would vibrate at high speed.

The other thing the Trend has is a very good Collet system. They are   ground and with a very slow tapper that locks in to the collect housing. This is why the collect has to be fitted into the gland nut before fitting to the router. I also make sure the tapers and cutter bore on the Collet's are really clean.

   regards Nigel.

Andy Bell08/10/2008 10:39:00
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156 forum posts
43 photos

Hi Nigel,

My router is a Trend 11 (same as yours by the looks) The extension however is  Record Power, supplied with the router table.  It looks exactly the same as one in your pictures, so I thought you had the Record Power extension as well.

Is everyone happy with CMT extensions? At £27.50 from axminster it looks good value. The Trend one around £50 as is the Dakota from Rutlands (but tht has a 1/4" adapator as well).  

Andy

Dauid Kent08/10/2008 12:41:00
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217 forum posts
1 photos
hi Nigel  the cmt extension cost me 34 pounds and its in 3 pieces so if any of it get damage you dont have to by it all again  daue
Ivor the engine08/10/2008 16:00:00
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270 forum posts
46 photos

Hi,  Tell me why does one need a extention on a router as i wonder if a router was designed for one as in my view if one was using a large cutter or any other cutter come to that it would put more stress on the bearings and cause vibration with more pieces to come loose i would think twice about using one,

I would be interested to know why one would need an extention as i have not heard of them before,

Ivor.

Olly Parry-Jones08/10/2008 16:41:00
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2776 forum posts
636 photos

Ivor, they're only used in table-mounted routers, often to compensate for the loss in depth of cut capacity when fixing the router to the underside of a plate of top. They can also be useful in those situations where your cutter is only 2 or 3mm short!

I certainly wouldn't like to use a larger raised panel cutter in one though.  I think you're right with your concerns towards vibration...

John Kinch08/10/2008 18:40:00
206 forum posts
91 photos
hi I've just modified my B&Q Pro router to increase the depth of plunge by half an inch by cutting down the body of the dust cover, which is the stop for the plunge. The collet now comes through most of the table plate  and finishes almost flush with the surface of the table top.    John Kinch.
Nigel Bennett08/10/2008 22:42:00
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153 forum posts
38 photos

Hi all

The main reason I use a extension in my table mounted router is because, when using a top mounted bearing profile cutter it doesn’t come through the table top sufficiently. However from the engineering point of view, if the spinning assembly is concentric, balanced and the bearings correctly designed , and assuming excessive pressure isn't placed on the cutter so as to cause it to deflect,there should be no problem with this type of assembly. But though I have never used a panel cutter, the length of the cutting face would apply large pressures on any router!

Regard all ,Nigel.

Dauid Kent01/10/2008 19:40:00
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217 forum posts
1 photos

hi i have record router table and for the 1st time i have come to use it i inserted the 1/2inch collet extension and a trend panel cutter i also have a trend t11 on the table is i turned the router up to full speed the whole collet and the panel cutter flew out but very luckuly missed me then i checked everything and then tryed it on a low speed and seemed to be ok i then turned it up to full speed and then really started to wobble so i turned it off and took it all down again then i put a 1/4 shank cutter in put it on number 3 reves seemed to be ok what is up with it with the 1/2 inch extension in it. 

                                           dave

Andy King01/10/2008 20:41:00
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170 forum posts
8 photos
19 articles

Hi David,

 Panel raisers aren't meant to be used at full speed, they are low speed only. Firing them up to full whack makes them very unstable as you have found.
If you look at the Trend website, or in their catalogue they usually have recommended maximum speeds for the bigger cutters. This link: http://www.trend-uk.com/en/UK/safety-UK/ shows a chart with recommended speeds for cutter diameters. (bigger box, bottom left of the chart)

hope this helps,

Andy

Mike Garnham01/10/2008 20:41:00
4114 forum posts
1 photos

The collet and cutter flew out???!!

You are one lucky so-and-so not to have been hurt....

I can only think that the collet wasn't done up properly. I can't imagine it is any fault of the table. If this is a new router, maybe you weren't used to the feel of the collet. If it is an old one, maybe you forgot to do it up, or maybe it is faulty.

Maybe it is the cutter. Could it be that the shaft is bent, or that the shaft is possibly undersized? If it is a new cutter then it may be that it was mis-cast, and is imbalanced.

I suggest trying the 1/2" collet with a straight cutter. If there are no problems it would suggest that the big cutter is at fault.......If you have a lathe or a pillar drill and could give the cutter a spin in that, you may be able to tell if is eccentric........or ask an engineer. Ultimately, if in doubt, chuck it out.

Mike

Nigel Bennett01/10/2008 20:46:00
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153 forum posts
38 photos

Hi Dauid

Make sure the collect locate correctly in the retaining nut, then the extension piece needs to pass in to the full length of the collett . After that the cutter could be incorrectly made i.e. not balanced because its running eccentrically? I have just ordered a trend extension piece for my table ,I'll let  you know how I get on! 

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