Oval shaped lollipop cutters?


Results 1 to 13 of 13

Thread: Oval shaped lollipop cutters?

  1. #1
    Member
    Join Date
    Nov 2012
    Location
    United States
    Posts
    591
    Downloads
    0
    Uploads
    0

    Default Oval shaped lollipop cutters?

    I have an interior sidewall groove that needs to be rounded -- it's like a thread, but cut with a scoop instead of a vee shape. Luckily, it's in 6061 aluminum, so not very hard to cut.

    The lollipop cutters I can find all look like the left of this picture, but I need something that looks like the right. Ideally, 1/4" diameter, where "diameter" is the diameter of the round part, so the total width is more like 1/2" or whatever adding the center shaft will make it.

    Oval shaped lollipop cutters?-lollipop-cutters-jpg

    Where can I find a cutter like this?

    (The closest I've found is McMaster: https://www.mcmaster.com/2820a74 -- but ... 6 flutes? Not for aluminum, surely? Also, 3/4" shank is hard to get into the TTS holders I have, which top out at ER20 and 1/2" Weldon.)

    Similar Threads:
    Last edited by jwatte; 06-29-2019 at 02:13 AM.


  2. #2
    Community Moderator Jim Dawson's Avatar
    Join Date
    Dec 2013
    Posts
    5717
    Downloads
    0
    Uploads
    0

    Default Re: Oval shaped lollipop cutters?

    Look for a fluting router bit in the radius that you want. They work great for what you are doing.

    https://www.amazon.com/Freud-99-030-...AJ3DF4A1WAP86K

    Jim Dawson
    Sandy, Oregon, USA


  3. #3
    Member popspipes's Avatar
    Join Date
    Jun 2014
    Location
    United States
    Posts
    1777
    Downloads
    0
    Uploads
    0

    Default Re: Oval shaped lollipop cutters?

    Quote Originally Posted by jwatte View Post
    I have an interior sidewall groove that needs to be rounded -- it's like a thread, but cut with a scoop instead of a vee shape. Luckily, it's in 6061 aluminum, so not very hard to cut.

    The lollipop cutters I can find all look like the left of this picture, but I need something that looks like the right. Ideally, 1/4" diameter, where "diameter" is the diameter of the round part, so the total width is more like 1/2" or whatever adding the center shaft will make it.


    Oval shaped lollipop cutters?-lollipop-cutters-jpg

    Where can I find a cutter like this?

    (The closest I've found is McMaster: https://www.mcmaster.com/2820a74 -- but ... 6 flutes? Not for aluminum, surely? Also, 3/4" shank is hard to get into the TTS holders I have, which top out at ER20 and 1/2" Weldon.)
    I have used form cutters on the lathe, they need to be held close to the cutter or I would get chatter easily. I use sprutcam and I dont think I can program a negative contour in a waterline op, if I could maybe use a small slotting saw radius ground and use multiple passes.
    I have used a woodruff cutter to cut a groove in the bore of a part but it was a single pass, normal entry, and fake the diameter (negative stock) to get it to undercut the part.

    mike sr


  4. #4
    Member
    Join Date
    Nov 2012
    Location
    United States
    Posts
    591
    Downloads
    0
    Uploads
    0

    Default Re: Oval shaped lollipop cutters?

    If I could grind my own, then yes, I actually longingly thought about that!

    Also, what's extra annoying is that the diameter of the bore I'm milling this groove in is 25mm, so a 1-1/4" radius cutter isn't going to fit. And it has a dead bottom, so a very small slitting disc won't fit, because the arbor tip would bump into the bottom of the bore.

    I'm going to look at wood router bits, because there's lots of forms to be had there! If I find something without a bearing on the tip, and go easy on the DOC I think that might work!

    This one is almost right, but too wide: https://www.amazon.com/Woodtek-92141...5&s=hi&sr=1-10
    Same thing with these: https://www.amazon.com/CMT-855-701-1...5&s=hi&sr=1-16
    I ended up finding one of these, which is too thin, but I think I can take multiple passes and get where I need to go: https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

    If I had 5D milling, I could do this good enough with a simple ball end mill. Looking with lust at that UM-750 that Saunders is showing off on his YouTube channel :-)



  5. #5
    Member
    Join Date
    Apr 2011
    Location
    USA
    Posts
    720
    Downloads
    0
    Uploads
    0

    Default Re: Oval shaped lollipop cutters?

    Most of the wood working world call these fluting bits.

    Here is a sample from one company of bits without bearings. Never dealt with them, so I don't know if their products are well thought of or not, but should give you an idea what types of bits are available.

    Terry


    https://www.magnate.net/SearchResults.asp?Cat=510098

    Attached Thumbnails Attached Thumbnails Oval shaped lollipop cutters?-fluting-bit-jpg  


  6. #6
    Member
    Join Date
    Nov 2012
    Location
    United States
    Posts
    591
    Downloads
    0
    Uploads
    0

    Default Re: Oval shaped lollipop cutters?

    Thanks! The main problem with all of those that I found (also known as "canoe joint bits" it seems) is that they are too wide -- my bore is 25mm, most bits are 1-1/4" or 1-1/2" which won't fit :-(



  7. #7
    Member AUSTINMACHINING's Avatar
    Join Date
    Mar 2011
    Location
    usa
    Posts
    480
    Downloads
    0
    Uploads
    0

    Default Re: Oval shaped lollipop cutters?

    Go look at convex cutters on the suncoast tool website. Ive used them on undercut rad work



  8. #8
    Member
    Join Date
    Apr 2011
    Location
    USA
    Posts
    720
    Downloads
    0
    Uploads
    0

    Default Re: Oval shaped lollipop cutters?

    It looks like those Suncoast cutters are pretty close to what you need, if there is enough depth for your part.

    You mentioned earlier about the 3/4" shank on the mcmaster tool, I'm sure you know you can just put that in your mill's collet and skip the TTS. If your part is a one-off or you need just a couple you can zero the tool when you use it, of if you need repeatability, you can put a collar on the shank of the tool to measure from and it will be essentially a TTS tool.

    Terry



  9. #9
    Member kstrauss's Avatar
    Join Date
    Apr 2013
    Location
    Canada
    Posts
    1788
    Downloads
    0
    Uploads
    0

    Default Re: Oval shaped lollipop cutters?

    Quote Originally Posted by jwatte View Post
    Thanks! The main problem with all of those that I found (also known as "canoe joint bits" it seems) is that they are too wide -- my bore is 25mm, most bits are 1-1/4" or 1-1/2" which won't fit :-(
    Pricey for a wood cutting bit but see https://www.amazon.ca/Amana-Tool-Car...dp/B000P4QDOS/ I haven't checked if they are on the Amazon US site.

    Use a collar or an ER32 TTS holder for the 3/4-inch shank cutters.



  10. #10
    Member popspipes's Avatar
    Join Date
    Jun 2014
    Location
    United States
    Posts
    1777
    Downloads
    0
    Uploads
    0

    Default Re: Oval shaped lollipop cutters?

    Maybe a hand ground single lip form tool in a 3/4" boring bar??

    There are companies that will grind a tool as per your drawing.
    Is this a one off part?
    how deep is the slot in the bore?
    how deep is the slot?

    It has been my experience that a .5 radius cutter feeding straight in will be a recipe for chatter unless you can chuck it very close to the cutter and low rpm.
    Wood router bits may give you the shape you need but the shank on them I dont believe will be beefy enough.

    good luck.

    mike sr


  11. #11
    Member
    Join Date
    Nov 2012
    Location
    United States
    Posts
    591
    Downloads
    0
    Uploads
    0

    Default Re: Oval shaped lollipop cutters?

    This is a prototype, so there will only be a few parts. (As prototypes go, there will surely be more than one, though :-)
    The groove is just under 3mm deep in the wall of the bore.
    The bore is 12mm deep, so just under two full grooves tall.
    The bore is 24mm wide. This is the biggest challenge -- 7/8 will "just fit" and I'm going to have to take shallow cuts to avoid packing it full of chips that can't get out.

    Thanks for all the advise! Knowing what to look for and what to compare is super helpful. I'm going to try this guy out: https://amzn.to/2XEArKG -- and run multiple passes of the thread milling program from Fusion to get to the required shape. Good news is, tolerances for smoothness are 5 thou, so I don't need 100 passes to get it good enough.



  12. #12
    Member handlewanker's Avatar
    Join Date
    Sep 2006
    Location
    Australia
    Posts
    6463
    Downloads
    0
    Uploads
    0

    Default Re: Oval shaped lollipop cutters?

    Hi, how long is the groove......could you cut it from the end with a long slot drill?...…..a 150mm long slot drill from each end will give you 300mm length of cut and a clean up with a woodruff type cutter as previously shown.
    Ian.



  13. #13
    Member
    Join Date
    Nov 2012
    Location
    United States
    Posts
    591
    Downloads
    0
    Uploads
    0

    Default Re: Oval shaped lollipop cutters?

    It's not long at all; if I had a tilting rotary table I could cut it with a ball end mill. But I only have 3 axes! (And before someone asks, I also don't have a lathe... I'm allowed one new machine tool per decade only!)



Tags for this Thread

Posting Permissions

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


About CNCzone.com

    We are the largest and most active discussion forum for manufacturing industry. The site is 100% free to join and use, so join today!

Follow us on


Our Brands

Oval shaped lollipop cutters?

Oval shaped lollipop cutters?