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Powematic CBM21 boring Machine11/5
I would like to buy a vertical boring machine to drilll my shelf pin holes. I have found a used Powermatic CBM 21 that seems to me like a good solution if the machine works well. I have not found any reviews online. Does anyone have any experience with the CBM 21? Did you use it for dowel hole boring or for shelf hole boring? Is there anything specific I should look at when I go to check the machine out?
I don't have experience specific to this mode but single head borers are much the same. I would check it for pneumatic leaks, make sure the fences adjust and lock properly and that the motor operates. Then I'd make sure all the tooling and collets are present.
Line borers are nothing but money makers. I bought a single head 21 spindle second hand years ago. It's only requires maintance has been grease and a patched airline. If I had it to do over I'd have bought a 2 head unit. I surmised that it would be more than twice as fast.
I would not suggest a single head boring machine as a dedicated line boring machine. Using separate reference points for your 5mm holes from front line to back line will be inaccurate, especially when drilling anything taller then 28" or so. If you're going to use this machine for both construction and line boring then it might make sense because you get more out of the machine and don't take up more space in your shop.
If you want a dedicated line boring machine I suggest you find a two head machine. That is the reason they made two headed line boring machines. The accuracy of drilling both lines at the same time from the same reference point makes all the difference plus you get the added speed without any setup time of moving rulers and stops.
Hope this helps.
I googled the Powermatic machine. It's a construction boring machine. I have one by another maker. The machines are well suited to drilling holes for confirmat screws or dowels. They can do a lot of other useful tasks with careful setup. But because you have to flip the panel around to drill the second row of holes when line boring any deviation from square or consistent width in the panel will cause the second row to not be drilled on perfect 32mm centers in relation to the first row.
I like my machine, but I drill my shelf pin holes with something else.
I considered that Powermatic machine and was a out to pull the trigger on it when I found a Deihl machine on Craigslist. Mine is a single head machine, and I won’t argue that a double head is faster and precise but my machine is dead on. I use different gauge blocks off the stops for different procedures.