I am working on an old Blanchard grinder, vintage 1940. On this model, the table rotates but does not reciprocate under the wheel head. There is no identification about model or serial number I have been able to find.
Which direction are the table and wheel head supposed to rotate? I can't find any markings.
The magnetic chuck seems quite weak. It has much less holding power than a typical permanent magnet surface grinder chuck. There is a tag on the machine stating the chuck is wired for 230 volt DC. There are 4 wires coming out from the table, numbered 1,2,3, and 4. 1 and 2 are a pair with 120 ohms resistance, and 3 and 4 are a pair with 160 ohms resistance. There is no conductivity between the pairs. The pairs are now wired in series, so each sees roughly 100 volts (the rectifier is putting out 200V DC). There is no provision for variable magnet power.
Does anyone know if the slip ring (I presume) connections are serviceable without pulling the table? Could it be that the original design had a switch to allow wiring the two magnet circuits in either parallel or series for variable holding power?
Any comments on operation of the machine would be appreciated as well.
Which direction are the table and wheel head supposed to rotate? I can't find any markings.
The magnetic chuck seems quite weak. It has much less holding power than a typical permanent magnet surface grinder chuck. There is a tag on the machine stating the chuck is wired for 230 volt DC. There are 4 wires coming out from the table, numbered 1,2,3, and 4. 1 and 2 are a pair with 120 ohms resistance, and 3 and 4 are a pair with 160 ohms resistance. There is no conductivity between the pairs. The pairs are now wired in series, so each sees roughly 100 volts (the rectifier is putting out 200V DC). There is no provision for variable magnet power.
Does anyone know if the slip ring (I presume) connections are serviceable without pulling the table? Could it be that the original design had a switch to allow wiring the two magnet circuits in either parallel or series for variable holding power?
Any comments on operation of the machine would be appreciated as well.