Posts

Rebuilding a Delta Bench Grinder

There was an Email on the CAMS server last week for a couple of Delta bench grinders for sale CHEAP (one 3PH, one 110V). Both had floor stands. Too good to be true, but I Emailed that I was interested, and forgot about it (too late, I thought). Well long story short; I ended up with the two grinders (less stands), after the lucky buyer took the bases out of the deal. I would have liked to have gotten the bases, but this deal was good enough to grab up, anyway. I wired the 3PH grinder up with my new test circuit, and lo and behold: it worked!
Unfortunately the 110 volt grinder seems dead, but was complete enough to be worth saving. I stuck it off to the side, planning to play with it after a while, but started to think about all the “future projects” I’ve got around here, and decided to pass some of my good luck along to the next guy. It took one Email to sell the bad grinder to another CAMS guy for 20$, and he is plenty happy to have the parts to get his grinder up and running.
Heres some pics:

 

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Can You Identify This Tapping Head?

I could use a little help, I bought this tapping head at last years CAMS Yard Sale, and have been unable to find any info on the manufacturer. I was able to get a J440 collet last week from Ebay seller C178, and a R8 adapter from JTS Machine, so I’m about ready to start tapping. I really needed to get a larger tap collet than the one I got with the head, because most of the tapping I do is 5/16 or larger. the J441 collet is for a much smaller tap. I was able to (finally) find a collet that went to 5/8 (tap capacity).

What I would like to find out is: What is the maker of this tapping head (there are no markings), and what are the service requirements? I don’t know if the head needs oil, or is it run dry? There appears to be a drain plug in the bottom, which I don’t want to remove unless I have some info first. Heres a couple of shots and the specs off the chuck.

 

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How Old Is My Bridgeport Milling Machine?

I’ve seen this question asked on a number of users groups over the years, and thought a better question would be: “Where are the serial numbers that date my Bridgeport mill?”. It seems that most new owners try and look up the numbers on the head itself.

THIS IS NOT THE NUMBER THAT DATES YOUR MACHINE!
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THIS IS THE ONE YOU ARE LOOKING FOR
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The serial number for your machine is on the front of the knee, behind the bearing retainer for the cross feed screw. You may have to slide the saddle slightly to the rear of the machine, as the way covers may hide the serial numbers if the saddle is in the forward position.
If you plug the serial number into the chart below, it will give you the year of manufacture of your machine. Be advised; while most machines will spend their entire lives in one piece, many a milling machine has a later, or earlier head swapped onto it. This chart is to date the basic machine.

BH-1 THRU BH-39 Round ram 1938
BH-40 THRU BH-252 1939
BH-253 THRU BH-656 1940
BH-657 THRU BH-1549 1941
BH-1550 THRU BH-2943 1942
BH-2044 THRU BH-4105 1943
BH-4106 THRU BH-4997 1944
BH-4998 THRU BH-5930 1945
BH-5931 THRU BH-7235 1946
BH-7236 THRU BH-8814 1947
BH-8815 THRU BH-10381 1948
BH-10382 THRU BH-11378 1949
BH-11379 THRU BH-11379 1950
BH-12751 THRU BH-14489 1951
BH-14490 THRU BH-16700 1952
BH-16701 THRU BH-19367 1953
BH-19368 THRU BH-22732 1954
BH-22733 THRU BH-26962 1955
BR-26963-THRU BR-31618 Start of V ram 1956
BR-31619 THRU BR-37278 1957
BR-37279 THRU BR-42110 1958
BR-42111 THRU BR-46938 1959
BR-46939 THRU BR-52598 1960
BR-52599 THRU BR-58552 1961
BR-58553 THRU BR-64987 1962
BR-64988 THRU BR-71981 1963
BR-71982 THRU BR-79538 1964
BR-75939 THRU BR-88180 1965
BR-88181 THRU BR-98089 1966
BR-98090 THRU BR-108351 1967
BR-108352 THRU 118640 1968
BR-118641 THRU 131778 1969
BR-131779 THRU BR-138139 1970
BR-138640 THRU BR-143350 1971
BR-143351 THRU BR-149294 1972
BR-149295 THRU BR-157909 1973
BR-157910 THRU BR-167652 1974
BR-167653 THRU BR-174083 1975
BR-174084 THRU BR-180697 1976
BR-180698 THRU BR-188559 1977
BR-188560 THRU BR-196987 1978
BR-196988 THRU BR-206296 1979
BR-206297 THRU BR-216473 1980
BR-216474 THRU BR-227523 1981
BR-227524 THRU BR-231700 1982
BR-231701 THRU BR-235985 1983
BR-235986 THRU BR-241350 1984
BR-241351 THRU BR-245659 1985
BR-246660 THRU BR-248551 1986
BR-248552 THRU BR-250531 1987
BR-250532 THRU BR-252874 1988
BR-252875 THRU BR-255463 1989
BR-255464 THRU BR-257888 1990
BR-257889 THRU BR-259897 1991
BR-257898 THRU BR-262188 1992
BR-262189 THRU BP-264586 1993
BR-264587 THRU BR-267635 1994

 

Usually, in the front of the knee by the serial number, you will find a “BR” logo.

A 12-BR will indicate 12 inches of table travel. You will find this on most J heads.

A “BR” with no numeral will indicate that 9 inches of travel (an early model).

 

I will update this list as info becomes available.

Please have a look at the and let BlueChipMachineShop.com provide your special maintenance and tool needs..