Roger Bisby is chasing the dream with Metabo.
Having owned a diamond chaser and dust extractor for the past 15 years I am still slightly taken aback by how many trades still seem to do things the hard way.
By that I mean using a small angle grinder with no dust extraction and a small SDS hammer. Not only is it a lot more dusty and unhealthy it is also slower and, very often, the impact damage causes minor cracks in the walls.
There are quite a lot of wall chasers out there, but this MFE 40 from Metabo is sold as a kit with their dust extractor, which means it is optimised. It couples up with no need for adaptors, and it handles the dust created by the chaser with ease. It also has a low friction non-kink hose that is 4 metres long, which means you can get the chaser close to the ceiling and still have some play on the hose.
The chaser is well thought out in most respects, with plenty of power coming from a 1,700 watt motor 110 or 1,900 240V. You may think this is overkill, but it is turning two or even three grooves at the same time, and will cut up to 40mm deep.
It can also give you a totally cleaned chase, so it is removing a lot of material. For that reason there is an LED light on either side to warn you of overload.
Where this chaser really stands out from the competition is in the blade change. You can make a single cut with one blade or a dual cut with two, or, by fitting the offset double for 20mm, or even a triple blade for 30mm, you can remove all the material and save having to break out the middle of the chase. The blade change to achieve all these variations is probably the easiest of any chaser out there, with no need to split the housing to remove the discs.
By using the spacers I manged to get the cutter width adjusted to exactly the width of the plastic conduit, which meant it hardly needed anything to hold it in the chase. You can actually use Omega wall slot clips, and just pop the conduit in, but I used a bit of Soudal adhesive spotted on the back.
If you have never used a diamond chaser you need to know that there is a direction of travel. In other words you are working into the uncut chase rather than away from it. If you run the opposite way to the arrow, dust will escape the hood through the lines you have already cut. That is all standard stuff, but the problem with this machine is that you are pushing it up the wall rather than down.
It is a lot harder work than simply placing it up at the top and leaning on it while it gently falls by gravity. Who would not want to make use of gravity? It is free and (as far as I know) available worldwide. Having used Metabo wall chasers that did work from the top down I can’t understand who suddenly thought it was a good idea to turn the whole thing on its head.
All I can think is that they have adapted an existing tool (angle drill?) to make a chaser. It is a great pity because, in every other respect, I love this machine and it is a great price, so if pushing up the wall is not a problem for you I can recommend it.
The dust extractor, which comes in the kit, is a formidable M class machine. I have used many others which are in most respects the same so I don’t know if this is a Metabo machine or simply badged up, but it works and has no problem doing the job.