[quote author=ChippyMal link=1136743299/15#28 date=1139142657]I did look at using 17mm guide bush, but wouldn't cutter need to be half a mil bigger @13.2mm !! [/quote]
If the guide bush is 1mm bigger then the cutter needs to be 1mm bigger, too. If you are using a 1/2in (12.7mm) cutter in conjunction with a 5/8in (15.9mm) guide bush the distance from the cutting edge to the outside of the guide bush is 15.9 - 12.7 / 2 = 1.6mm. Therefore your guide bush needs to be 2 x 1.6mm (3.2mm) bigger than any cutter you use, or the cutter 3.2mm smaller, it's the same difference. A 17mm GB would require a 17 - 3.2mm = 13.8mm cutter, but as cutters vary somewhat in their exact diameters (Trend especially) you would probably find that a 14mm metric cutter would be near enough in this application (especially after it had been out to the sharpeners a couple of times). I just find it odd that Trend, etc use 16mm or 5/8in when European standards are 17mm.
[quote author=ChippyMal link=1136743299/15#28 date=1139142657]Another reason for wanting to fit Trend bushes is I already have several for my 240v router, I just can't use it on site as it's 110 only, iv'e just been on trend site and can't see anything suitable [/quote]
What about using a
Trend Unibase (about £13+VAT) on your existing router? I'm familiar with the problems caused by the Bosch bayonet system (I have a GOF900ACE, too) - they won't take anyone elses guide bushes. Aren't even drilled on the underside.
[quote author=ChippyMal link=1136743299/15#28 date=1139142657]...has anyone tried using 240v router on 110v? [/quote]
As Wolf said - don't even go there
Regards
Scrit