If you just bought the Bosch Colt you may want to return it and get the VS one, you don't want to spin the bits 33,000 rpm's ,that's a good way to burn up the bits.
He would, if he could, but he can't, Bob; get a variable speed one here, that is - or at least he couldn't a couple of weeks back when I last asked the question of Bosch UK. The GKF600 in Europe
is a 230 volt 50Hz version of the Bosch Colt PR10 (with the UK getting a 110 volt 50Hz version for site use). It is a single speed laminate trimmer
variable speed and as part of the Bosch blue range is sold into the trade/industrial/professional market here (DIY/home woodworker lines are green). We just don't have the variable speed model available, yet, although the recent introduction of the deWalt D26204K
may well change all of that. One can only hope that it happens
I suppose that the reason for a single speed tool is quite simple, really. The GKF600 was introduced to replace the previous 600 watt fixed base laminate trimmer
, confusingly also called a "GKF600". Laminate trimmers don't benefit much from having variable speed, IMHO, and Bosch presumably see the primary customer for this tool as a professional woodworking factory or professional installer who will use it for trimming and small tasks. Add to that the fact that over here there is (and for quite some time has been) an abundance of small, low-cost plunge routers available which are all much cheaper than the GKF600, e.g. Power Devil PDW5037
, Axminster White AW635R
, Direct Power PR1020E
, Trend T4
, Einheil RT-RO55
, Einheil OF1200
, etc (some of these are now superceded) and it becomes obvious that the GKF600 isn't going to compete on price in the DIY market evdn with variable speed.
I didn't think much of the variable speed vs fixed speed issue when I bought it. But now when I look at the recommended rpm for the different bits I get confused. I've searched in many forums on the internet but haven't found the information I need. Maybe I'm missing something (please tell me what) but the fixed, no load, speed for the router is 33000 rpm. I've read the recommended bit speeds on this forum which states 24.000 rpm for bits less than 1" and lower speeds for larger bits.
I use a GKF600 regularly for laminate trimming, hinge recessing and simple edge profiling with cutters up to about 25mm in diameter. The size restriction isn't a problem if you all you are doing is putting a 3mm radius edge of PVC edge banding, or a 4mm chamfer onto an oak table top, or recessing a hinge to a depth of 3mm, or trimming a laminate overhang with a low cost trimming bit
. etc. In fact for laminate trimming where a polished finish is required the high speed is actually an advantage. However, the the single speed of the GKF600 means it is not a true router. So providing you don't want to run big bits it should work well.
Is it the case that under load, the rpm will drop and fall within the bits recommended range? Seems a little uncertain. Do I need to find router bits that is specified for 33.000 rpm usage?
No and no. Standard carbide cutters will work well. Just keep your bits to the smallest diameter you can and aim for cutters under 25mm, and avoid big heavy cutters. I've found that the GKF600 does require a particular approach; cuts should be very shallow and the GKF should be fed quickly to avoid scorching the wood, especially on end grain. It is better to make 2 or 3 shallow passes than a single deep one and by doing that it maintains constant speed and doesn't bog down.
If I were looking for a one and only router it wouldn't be my tool of choice, but for doing those trimming and edge profiling tasks which crop up often in my line of work it is a very useful addition to my tool kit.