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Need Jaws

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  • Need Jaws

    I have a Clausing 10" lathe I bought at a school auction. The 3-jaw chuck has two sets of outside jaws but no inside jaws. Does anybody have inside jaws they would like trade? The chuck has no brand marking but has the number "7" and "7060" and "Made in ENG" on the face. It is 6" diameter and 2 7/8" thick. The jaws are 2 1/2" long, 3/4" wide, with steps at 1 3/4", 1 3/8", & 1 1/16" high. There are 10 teeth on the bottom, 5/32" deep. The side grooves are 1/8" deep by 5/16" high. Any help would be appreciated. Thanks.

  • #2

    Sounds like a Pratt chuck, what is the depth from the lower tooth face to the side groove (1/8th x 5/16th dimension). I'll warn you that genuine Pratt jaws cost the Earth. I recently got around this problem by buying a set of soft jaws for my 5" Pratt chuck and machining them till they looked just like the real thing, then I case hardened them - cost آ£20. 'The real thing' Pratt price آ£120+ carriage

    Remember to check the scroll for damage or wear. A new set of jaws is not always the answer to a maidens prayer when it comes to regaining accuracy! My 5" chuck was in superb condition - hardly used - but I was not going to pay that sort of money for a set of jaws if the scroll was shot to bits.

    BTW آ£1 = $1.50ish

    I can put you in touch with a company in the UK who will supply these soft jaws (or 'the real thing' if you have a fat wallet).



    • #3
      Oh, sure, ask for the one measurement I didn't take! I can't get to the lathe until the weekend, so it will have to wait. Doesn't sound promising though, maybe I can weld and regrind the spare set and turn them into inside jaws?


      • #4

        I know, ....There's always some smart (Rag)arse!! I can find the jaw type with what you've given me - always good to have 100% information rather than 95% though!

        Hell! Think of the cost of all that welding (Rods + electricity), followed by the rough fettling and finish grinding. Let me have a look to see what I have in my dead box.



        • #5
          Thanks, RR. I wish I had a "dead box" to dig into. All I have is "inventory" that is too good to throw away, but not useful enough to keep!


          • #6
            Sounds like a Pratt-Bernard to me too. If you know the brand of your chuck many companies sell replacement jaw sets, or if you are lucky uo may be able to replace them with a set of Master Jaws and a set of Reversable Hard Top Jaws. I would never buy any chuck with regular jaws if the Top Jaw type is available (they rock - plus they can be replaced by machinable soft jaws and large Aluminum pot jaws). If the chuck is old and crotchety consider a Bison - great chucks for the money.

            Hey RR, you convince the good wife on that Schnaublin yet? I here hypnosis works sometimes...


            • #7

              I agree on the Bison chuck's - great value for money (in fact less than the replacement jaws for the Pratt would cost!). I take it by 'Master Jaws' you are referring to what we in the UK would call a 'Coventry' chuck (invented by Alfred Herberts IMMSMC). Nice chucks these ~ they fetch good money secondhand as they are quite sort after.

              Been working on the hypnosis with Mrs. Raglan ~ unfortunately I don't think the snore, followed by the soft exhale and the muttered word ...S...H...A...U...B...L...I...N is working very well. I just wake up in the morning with bruised ribs and shins!!!!



              • #8

                Check this out:
                or or

                Northfieled makes Diaphragm chucks with repeatability down to .oooo4"/and up to 12K rpm


                • #9



                  • #10
                    Thanks for your help. I had hoped against odds to find someone like me who had two sets of inside jaws and needed to trade for one of my sets of outside jaws. Now I hear that sharks have two sets of inside and outside teeth, but that's not quite the same and I don't like dealing with sharks anyway. The web sites you have furnished will get me on the right track. Thanks again.
                    By the way, the hypnotism won't work unless the subject is willing. My wife has no problem with me buying stuff and did not make a "honey-do" list when I retired. I reminded her long ago that I don't waste money on wine, women or song, fix anything around the house for free, let her buy what she wants, and most of all pointed out that I worked hard for my retirement time. It is my time, I earned it, and now that I have it only I can decide what to do with it. I will help anybody, but I owe no time to anybody else unless I chose so. I know it sounds arrogant, but I put it much more diplomatically when I tell someone in person. That is why in my retirement I now have a lathe, mill, plastic injection machine, wire feed, metal brake, etc. and a 30x60 shop to put it into. Thanks again.


                    • #11
                      No problem brother - anytime. That is why we are here - to keep you guys happy, happy, happy!

                      Try: "Love of my life, you are so beautiful <schnaublin>, we should drop the kids at a siter and just go on a romantic <schnaublin> dinner and then a stroll by the river - your beautiful eyes <schnaublin> appear like stars in the moonlight..."

                      Brainwashing complete.

                      If that does not work I have an excellent receipe for Ginger stir-fried Yorkie - rats or cats maybe substituted (in accending order of intelligence) - that always woos 'em.


                      • #12
                        I am brand new to the BBS but have a few years under my belt with HSM , just been learning from all you fine folks,THANK YOU! Last year i picked up a beautiful Royal LebLonde metal lathe to compliment my smaller atlas benchtop , I restored the machine by totally tearing her apart and cleaning and repainting, so far I am very happy to have a quick change gear box and an overall much larger lathe , I have just had a few problems , One of which is that i have a japanese "SOUL" top jaw chuck that came mounted with the machine and the top jaws are missing , i ordered a soft set from MSC , but really desire a hard set, but I can't believe the price for a hard set of top jaws , would it be worth while to machine a set of my own from tool steel or similiar? does some one have a set for a 6.5 DIA. SOUL 3 jaw chuck also I am having problems with the quick change gear box this circa 1935 lathe cuts different pitches than what i set her up to cut , It has been a real trial and error process when i want to cut say, 32 tpi , on the chart it seems to be set up for 24 tpi, could there be pickoff gears changed or missing or am i not doing something correctly thanks for your help



                        • #13
                          The sites I mentioned above - in particular the Huron one should be able to help you with jaws. Just remember that the reason they are expensive is the care that is taken in matching them so they are interchangable and accurate. Once you find the most accurate paring for each top jaw mark the bottom with the jaw # so they stay together.

                          It sometimes makes more sense to buy a new chuck - a new Bison is often cheaper than a set of jaws for a Pratt-Bernard!


                          • #14
                            Did I miss something? The "jawsandchucks" site had almost nothing I even recognized the name of, so it was a little tough to give part numbers.

                            What's up with that?

                            I was looking for a couple specific items, but there was no way to get there it seemed like. I must have had "stupid pills" for breakfast.


                            • #15
                              I dug out a Pratt Burnerd catalogue dated 1968, they have no numbers like "7060".

                              Their older numbers were like "58" or "78"
                              and post 1968 were like "1210-91705" or "1780-01605".

                              However, I don't know what numbers they used in later years. Pratt Burnerd make excellent chucks thats for sure. They are still around, maybe you could inquire with them?

                              The only other UK brand I recall using was "Taylor", but they are easy to recognize - the chuck face between the jaws is heavily scalloped/relieved. BTW, this chuck was on a Dean Smith & Grace lathe, acknowledged as the "Rolls-Royce" of lathes a few years ago...