12/20/2023 0 Comments Porter cable router guide bushingsThe standard 60mm Trend bushes also fit a number of other medium-power routers, although their manufacturers tend not to publicise this point. Heavy-duty 1/2in routers usually come with a 30mm diameter guide bush as standard because that is the size required for applications such as kitchen worktop jigs, lock mortice jigs, and other trade applications, for which the big routers are particularly suited. The largest range of guide bushes is to be found, therefore, among medium-power routers with their combination of capability and portability. Guide bush work is essentially a hand-held operation, although there are a few rather contrived table applications. (See ‘Online Catalogue – Accessories – Guide Bushes and Bases’) These sets offer an economical way of acquiring guide bushes if you find yourself constantly using a particular size you can buy the steel version. Set 1 is metric in even sizes from 10mm to 32mm, Set 2 is in odd sizes from 11mm to 33mm, and Set 3 is in Imperial sizes from 3/8in to 1 5/16in. Most guide bushes are of steel construction but Trend offer three boxed sets of plastic bushes. Some of the non-Trend routers that accept Trend guide bushes Most popular models are catered for.Ī bonus with both these plates is that they come with a centring bush and pin so you can ensure concentricity with the motor spindle. The Trend Circular Sub-base is a higher quality plate, which you order to fit your particular router. When you have located the fixing holes the first time you fit the Unibase, mark them with a dab of paint to speed the process on future occasions. The Unibase fits most routers, including some of the very cheap Far Eastern models. (See in our online shop the Trend Unibase and the Trend Circular Sub-Base) The Trend circular sub-base fitted to the DW 625 router Trend offer two such plates: the Trend Unibase and the more expensive Circular Sub-base. If your router does not accept these bushes, and does not include a bush of the required diameter in its own range, you have to make or buy an adaptor plate to take them. They fit not only most routers from Elu, De Walt and Trend but also a number of other popular models. Most commercial jigs (whoever they are made by) come with a Trend-compatible bush as standard. The widest range by far is the Elu/ De Walt/Trend system, with a 60mm diameter plate attached to the router base with two 5mm countersunk screws. Regrettably, there is no standard size or fitting for guide bushes. If not, is there a way that I can make it fit my router?’ Your main consideration is ‘does the guide bush that comes with this jig fit my router. You don’t even have to know of the existence of the offset. When you buy a commercial device, such as a dovetail jig or a lettering template, it either comes complete with guide bush and cutter or it specifies exactly what sizes must be used. This offset is the key to understanding creative guide bush work and is probably the biggest stumbling block to the wider use of bushes, but it only arises when you make your own jigs and templates. Some commercial guide bush-based jigs and templatesīecause the cutter goes through the centre of the bush, the cut is offset some distance from the edge of the template. Concentricity can be checked and, to an extent, corrected by means of an alignment cone. Unfortunately, this is not always the case, usually with the cheaper Far Eastern models. It is also important for accurate work that the bush is a perfect circle and that the cutter goes through its centre. The cutter, obviously, has to be of smaller diameter than the guide bush in order to pass through it. The cutter plunges through the middle of the bush and the outside edge of the ring runs against the jig or template, to position the cut. The guide bush is essentially a circular flange, usually between 10mm and 40mm outside diameter, which fixes to the router base and acts rather like a small ring fence. In subsequent articles I will expand on guide bush applications and the making of templates.Ĭoncentricity being checked with alignment cone The subject is a large one and in this article I deal with the basics. but much of the creative work comes from using a range of different size bushes with home-made jigs and templates. There are, of course, a number of well-known commercial applications such as dovetailing, lettering, mitring kitchen worktops etc. A guide bush is one of the standard accessories supplied with nearly all routers, but reaction from my course students suggests that in many cases it remains unappreciated and unused. Guide bush work is one of the most creative areas of routing but one of the most neglected. GUIDE BUSHES PART ONE – THE BASICS Selection of guide bushes
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