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  1. #1
    Join Date
    Nov 2019
    Location
    Brisbane
    Age
    69
    Posts
    452

    Default Tap regrinding fixture back in action

    Hi from Old Steamer.
    SAM_0622.jpgSAM_0623.jpgSAM_0621.jpgAfter a few weeks I've got the new base made for this ancient tap regrinding fixture. The body casting wasn't finished in the swivel slots so only half the angle is available. A quick filing job will allow full movement. The flared cup wheel will be changed for a straight wheel, 38A80 if I have one. The 2 main rods can slide thru the body and taps up to about 200mm long can be ground. Each cam can be reversed behind the operating handwheel for L/H taps. I have also tapped the base with extra holes to allow the base to pivot the other way if needed. Using base plates like this makes it easy to repurpose a machine in minutes or have more than 1 setup on a table at the same time.
    After I make some sparks with it I will post a few pics of the work done. Now to find gulleting wheels.
    Regards
    BC

  2. #2
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
    Age
    64
    Posts
    4,887

    Default

    Is this for people's knowledge or are you providing a regrinding service, if a service have you considered pricing?

  3. #3
    Join Date
    Nov 2019
    Location
    Brisbane
    Age
    69
    Posts
    452

    Default Ancient tap sharpener.

    Hello Pipeclay.
    What I post here is for members interest and I hope a bit of learning. A lot of grinding can be done in the home shop with attachments for a good 6" bench grinder.
    Yes I do regrind cutters as part of what we offer customers and have been doing this for 15 years or so. I do not try for sales here as i don't think it would be inline with the forum policy. Besides there could not be a benefit for myself or the person needing a regrind, counting post 2 ways.
    My workshop space is crowded with 6 T & C grinders and many accessories. A lot of it needs a refurb. If anybody is interested I can put up a shop tour.
    In a few previous posts I suggested we all need to start seriously learning to sharpen tools. HSS cutting tools of good brand are already expensive and with the chance our dollar may fall with this difficult trading time getting the best cutting time out of them is important.
    All the best thru the long weekend to all.
    Regards
    BC

  4. #4
    Join Date
    Sep 2006
    Location
    Mallacoota,VIC,Australia
    Age
    53
    Posts
    1,010

    Default

    Great to see the Tap regrinding fixture is going to get some use BC. Don't forget your supposed to be able to regrind Reamers on it too. I look forward to see the results.
    All The Best steran50 Stewart

    The shortest way to do many things is to do only one thing at once.

  5. #5
    Join Date
    Jul 2014
    Location
    Alphen aan den Rijn, Netherlands
    Posts
    208

    Default

    Quote Originally Posted by steamloco1954 View Post
    If anybody is interested I can put up a shop tour.
    I for one would love to see a shop tour. A short explanation of how a tap is ground with this fixture would be appreciated too!
    Thanks,
    Peter

  6. #6
    Join Date
    Nov 2019
    Location
    Brisbane
    Age
    69
    Posts
    452

    Default Tap regrinding fixture.

    Hi Steran.
    Grinding reamers, hmmm. This fixture only gives radial relief grinding. The Clarkson top table can swivel by 45 deg. I'm hoping to be able to grind reamers by passing past the wheel. Similar to annular cutters.
    WoodBee2.
    The tap has to be timed to the cam. As the handle in turned the cam forces a roller down. A lever attached to the roller turns the rear shaft. A groove in the rear shaft acts on a lever pushing a rod towards the knurled chromed knob on the front housing. This movement lifts the rear of the housing moving the tap away from the grinding wheel. The chromed knob adjusts the amount of dead movement in the push rod for different size taps. Not having proportional adjustment the design is basic only. There is a tap size scale on the chromed knob.
    Next weekend I will try for a photo series of the shed.
    regards
    BC

  7. #7
    Join Date
    Sep 2006
    Location
    Mallacoota,VIC,Australia
    Age
    53
    Posts
    1,010

    Default

    In regards to grinding Reamers I was going how it was originally advertised when I bought it. I'd had in my head that you need to grind the Reamer along it's length which after doing some googling I realised is not correct unless you were aiming to reduce the diameter of a Reamer. I found this "Reamers
    are re-
    sharpened
    on the bevel at the end, which is where the cutting action takes place. It is not usually needed to grind the OD unless
    you
    want to make the
    reamer
    smaller." It actually makes a lot of sense that you only grind the very end of the Reamer which is something I hadn't thought of. I just watched a video on YouTube on Reamer sharpening and it shows just that - only grinding on the end.
    All The Best steran50 Stewart

    The shortest way to do many things is to do only one thing at once.

  8. #8
    Join Date
    Jul 2014
    Location
    Alphen aan den Rijn, Netherlands
    Posts
    208

    Default

    Hi BC,
    Thanks for the explanation!
    I thought taps were ground in the flutes, but from your explanation and the pictures my understanding is they are ground on the circumference of the point i.e. get shorter while grinding? I am trying to understand toolgrinding but it is quite a topic to get a understanding for.

    Peter

  9. #9
    Join Date
    Nov 2019
    Location
    Brisbane
    Age
    69
    Posts
    452

    Default Tap grinding

    Hello WoodBee 2.
    You can grind taps in the flute if there is enough damage to warrant it. Each pass reduces the H number by approx 1. Taps have a small amount of form relief. Google Tapsavers in USA. They have a good demo video.
    Look for an old book on Ebay called Tool Room Grinding, by Norton abrasives. Very good place to start. Also google Cincinatti No 2 tool and cutter manual. There a few sites with a free download.
    regards
    BC

  10. #10
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    71
    Posts
    5,942

    Default

    Quote Originally Posted by steamloco1954 View Post
    Look for an old book on Ebay called Tool Room Grinding, by Norton abrasives. Very good place to start. Also google Cincinatti No 2 tool and cutter manual. There a few sites with a free download.
    regards BC
    Thanks for the lead to this book BC. Picked it up for $0.77AU off Ebay, and an excellent read for anyone interested in sharpening their cutting tools.
    I did look at the Cincinnati manual also, but at nearly $200, landed here, I decided against it.
    Kryn
    To grow old is mandatory, growing up is optional.

  11. #11
    Join Date
    Nov 2019
    Location
    Brisbane
    Age
    69
    Posts
    452

    Default Tool grinding

    Quote Originally Posted by KBs PensNmore View Post
    Thanks for the lead to this book BC. Picked it up for $0.77AU off Ebay, and an excellent read for anyone interested in sharpening their cutting tools.
    I did look at the Cincinnati manual also, but at nearly $200, landed here, I decided against it.
    Kryn
    Hello from BC.
    The Cinci No 2 T & C manual is a good read however there is another by Cinci from the 1930's. I think it was from the Cincinatti machine tool company. The grinding machines had plain bearings and some flat belt drive. The fixtures and work heads were huge but the pics gave a good reference on how it was done. It was a read only book from an archive.
    Regards
    BC

  12. #12
    Join Date
    Jul 2014
    Location
    Alphen aan den Rijn, Netherlands
    Posts
    208

    Default

    Quote Originally Posted by steamloco1954 View Post
    Hello WoodBee 2.
    You can grind taps in the flute if there is enough damage to warrant it. Each pass reduces the H number by approx 1. Taps have a small amount of form relief. Google Tapsavers in USA. They have a good demo video.
    Look for an old book on Ebay called Tool Room Grinding, by Norton abrasives. Very good place to start. Also google Cincinatti No 2 tool and cutter manual. There a few sites with a free download.
    regards
    BC
    Hi BC,
    Thanks for your explanation. I found both books for download on the vintage machinery website, the Cincinnati book even in different versions.
    I also found a book "Universal Cutter and Tool Grinder" from Cincinnati. Is this the third book you mentioned?
    I really appreciate the Reference to the Cincinnati no 2 manual, because my tool grinder is a "enhanced" copy of this machine, which makes it almost a instruction manual for my grinder!
    Thanks again,
    Peter

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