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Hi,

Having wanted to build a timberframe since I arrived here in the US from the UK. I have gradually acquired the necessary tools to make a start. One of my latest acquisition is an older model Makita 7104 chain mortiser. I have used this tool before at a timberframing school but only for a short period. Is there anyone who would take the time to give me any tips on what to avoid or any insight they have gained from using this machine professionally. Experience is always valuable and I would like to gain from yours if you would spare the time to reply..

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Peter, Safety first Sam; unplug the machine when doing anything besides the routine cutting. One cutting tip; make sure you set the chain on the wood and measure with a measuring device to set the position of the depth stop. Otherwise enjoy those easy made mortises!

Ford Hall
Heirloom Timber Framing
1 tip I would give is to always "score" your lines with a sharp knife like an Olfa, and to not cut right up to the line (leave about 1/32-1/16 "), then take a SHARP chisel and just slice off the remaining using the line you previously scored. This way you get nice clean edges that aren't "jagged".
The Makita has three tilt settings. Always start your plunge cut with the arm straight up and down, and then move to the second setting and then the third. Keep the teeth sharp. It is easy to sharpen them with a chain saw file. Straight across both teeth at the same time. Also, I have found that with my mortiser the chain comes loose from time to time. I have never had anything bad happen, but I try to keep it tight when I can. Keep the chain well lubed too. After half a dozen mortises or so, just spray the chain with a good quality spray lube.

Best of luck!

Tim

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