Free 173 Best Homemade Tools eBook:  
Remove advertisements
Page 2 of 4 FirstFirst 1 2 3 4 LastLast
Results 11 to 20 of 39

Thread: Homemade Tool & Cutter grinder (with a difference).

  1. #11
    [email protected] tonyfoale's Avatar
    Join Date
    Nov 2016
    Location
    Spain
    Posts
    497
    Thanks
    208
    Thanked 833 Times in 263 Posts

    tonyfoale's Tools
    [QUOTE=olderdan;83420]
    Quote Originally Posted by A bit of trigonometry is all that is required to calculate what those angles should be given the nose and clearance angles that we are after, and I made a spreadsheet to do the heavy lifting. [/B

    I am impressed with your two axis sharpening method and would like to modify my Tiplap style sharpener with an indexer to be able to try it out.
    The biggest stumbling block for me are the calculations involved,(maths has always been my worst subject) having dyslexia doesn’t help.
    After watching your Drop-box videos, at some point you mention a spreadsheet you have created.
    So my question is do you plan to make this spread sheet available in some form to help dim wits like me.
    Dan,

    I have no secrets so I am quite happy to make the spreadsheet available to the forum. I'll check it over first to check how easy it would be for dim wits to use intuitively. Maybe I need to write a short "how to use" file. It might be a few days because the lines bringing the landline which I use for the internet were torn down a couple of days ago by a wayward truck and I'm on a backup system at the moment which has the same speed as the old dialup connections. Who remembers those days? One of the problems of living out of town. Accordingly, I am unable to upload anything substantial at the moment.
    In the morning I'll be looking into changing over to the WiMax system, because I am always having problems with my existing ADSL system. I'd be glad to hear from anyone who has had experience with WiMax.

  2. The Following User Says Thank You to tonyfoale For This Useful Post:

    jjr2001 (01-15-2017)

  3. #12
    [email protected] tonyfoale's Avatar
    Join Date
    Nov 2016
    Location
    Spain
    Posts
    497
    Thanks
    208
    Thanked 833 Times in 263 Posts

    tonyfoale's Tools
    [QUOTE=olderdan;83420]
    Quote Originally Posted by A bit of trigonometry is all that is required to calculate what those angles should be given the nose and clearance angles that we are after, and I made a spreadsheet to do the heavy lifting. [/B
    .................
    After watching your Drop-box videos, at some point you mention a spreadsheet you have created.
    So my question is do you plan to make this spread sheet available in some form to help dim wits like me.
    Dan,

    I have uploaded the spreadsheet to www.tonyfoale.com/sharpeningangles.xls
    Also I suggest that everyone interested should download and read this excellent article on drill point geometry
    DRILL POINT GEOMETRY by JOSEPH MAZOFF

    Instructions;
    Download to a folder of your choice. Open in excel.
    There are two calculation pages and two matching graph pages, one pair for drill bits and the other for near flat end mills.
    On each page there is only one data entry box, which is coloured green. DO NOT change any other values or you'll mess up the formulae.

    1. Drill bit page.
    Enter the included angle required for the bit, usually but not always 118 deg. Then look down the "relief angle" column until you find the nearest value to the 1st clearance angle that you want. For example say we want a clearance angle of 5 deg. we see values of 4.85 and 5.38. Now look across to the values of base angle and twist angle. The base angles are 31.31 and 31.39, and the twist angles are 9 and 10 deg. So we need to set the base angle to 31.3 deg and the twist angle to 9 or 10 deg.
    You might ask why I didn't make the relief angle values in whole numbers so that we could go exactly to 5 deg. Well if I did that we would get a base angle of 31.33 deg and a twist angle of 9.29 deg. Do you see the problem now? The spindexer only indexes in whole degrees so 9.29 is not available. So if we set that to 9 deg. and the base angle to 31.3 then we get a clearance angle of 4.85 instead of our target of 5. I would not cry over that difference. Or you could choose 10 deg and get a clearance angle of 5.35 deg.
    When you have ground the 1st clearance angles you repeat the lookup again for the 2nd clearance angle. Typically 20 to 25 deg. Let's go for 20, scroll down and we get 19.93 which corresponds to a base angle of 38.1 deg and a twist angle of 40 deg.

    2. Endmill/slot drill page.
    here in the green box we enter the 1st clearance angle, say 7 deg. Then look down to get the dish angle, typically 1 to 2 deg. We see that 2.05 deg is the nearest which requires the base angle of 7.3 deg and the twist (spindexer) angle of 107 deg.

    In practice you will not have to look up these values each time because you'll be using the same values for many jobs. You'll mostly want to do all your drill bits to the same point and clearance angles so you only need to note down the settings for those.

    I must point out that this spreadsheet is only valid for use with a 2 axes grinder as I have described in the main text. It has no validity for more traditional T&C grinders.

    Don't hesitate to ask I haven't made anything clear. Here is an example screen shot.

    Homemade Tool & Cutter grinder (with a difference).-screen.jpg
    Last edited by tonyfoale; 01-10-2017 at 04:33 PM. Reason: Text addition.

  4. #13
    [email protected] tonyfoale's Avatar
    Join Date
    Nov 2016
    Location
    Spain
    Posts
    497
    Thanks
    208
    Thanked 833 Times in 263 Posts

    tonyfoale's Tools
    Ignore this reply
    Last edited by tonyfoale; 01-10-2017 at 04:35 PM. Reason: Not needed

  5. #14
    [email protected] tonyfoale's Avatar
    Join Date
    Nov 2016
    Location
    Spain
    Posts
    497
    Thanks
    208
    Thanked 833 Times in 263 Posts

    tonyfoale's Tools
    Ignore this post.
    Last edited by tonyfoale; 01-10-2017 at 04:36 PM. Reason: not needed

  6. #15
    Content Editor DIYer's Avatar
    Join Date
    Aug 2013
    Posts
    3,087
    Thanks
    343
    Thanked 675 Times in 612 Posts


    Thanks tonyfoale! We've added your Tool and Cutter Grinder to our Grinding category,
    as well as to your builder page: tonyfoale's Homemade Tools. Your receipt:




  7. #16
    Content Editor DIYer's Avatar
    Join Date
    Aug 2013
    Posts
    3,087
    Thanks
    343
    Thanked 675 Times in 612 Posts


    Thanks tonyfoale! We've added your Spin Indexer Modification to our Machining category,
    as well as to your builder page: tonyfoale's Homemade Tools. Your receipt:




  8. The Following User Says Thank You to DIYer For This Useful Post:

    tonyfoale (01-10-2017)

  9. #17
    Content Editor DIYer's Avatar
    Join Date
    Aug 2013
    Posts
    3,087
    Thanks
    343
    Thanked 675 Times in 612 Posts


    Thanks tonyfoale! We've added your Grinding Angle Spreadsheet to our Grinding category,
    as well as to your builder page: tonyfoale's Homemade Tools. Your receipt:




  10. The Following User Says Thank You to DIYer For This Useful Post:

    tonyfoale (01-10-2017)

  11. #18
    Jon
    Jon is online now Jon has agreed the Seller's Terms of Service
    Administrator Jon's Avatar
    Join Date
    Jan 2012
    Location
    Colorado, USA
    Posts
    13,331
    Thanks
    2,576
    Thanked 5,056 Times in 1,916 Posts
    Try unchecking the "Automatically parse links in text" and "Automatically retrieve titles from external links" options when posting; sometimes the forum url posting feature tries too hard to be clever.

    We also have a new Practice Posting subforum where you can play around with the features.

  12. The Following 2 Users Say Thank You to Jon For This Useful Post:

    philipUsesWood&Brass (07-01-2018), tonyfoale (01-10-2017)

  13. #19
    [email protected] tonyfoale's Avatar
    Join Date
    Nov 2016
    Location
    Spain
    Posts
    497
    Thanks
    208
    Thanked 833 Times in 263 Posts

    tonyfoale's Tools
    Quote Originally Posted by Jon View Post
    Try unchecking the "Automatically parse links in text" and "Automatically retrieve titles from external links" options when posting; sometimes the forum url posting feature tries too hard to be clever.

    We also have a new Practice Posting subforum where you can play around with the features.
    Thanks Jon, I'll go play on the practice pitch.

  14. #20
    [email protected] tonyfoale's Avatar
    Join Date
    Nov 2016
    Location
    Spain
    Posts
    497
    Thanks
    208
    Thanked 833 Times in 263 Posts

    tonyfoale's Tools
    Quote Originally Posted by DIYer View Post
    Thanks tonyfoale! We've added your Grinding Angle Spreadsheet to our Grinding category,
    as well as to your builder page: tonyfoale's Homemade Tools.
    I must point out that this spreadsheet is only valid for use with a 2 axes grinder as I have described in the main text. It has no validity for more traditional T&C grinders.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •