CNC

You are not logged in. [ Login ] Why log in
(NOTE: Login is not required to post)

Post a Response
The staff at WOODWEB assume no responsibility for the accuracy, content, or outcome of any posting transmitted at any WOODWEB Forum. Participants should undertake the use of machinery, materials and methods discussed after considerate evaluation, and at their own risk.
Your Name:
Your Website:
Email Address:
Subject: Re: CNC plunging

Message:

(read message guidelines).
Note: Do not use the below fields to advertise your business - only for links related to the discussion.
Thread Related Link URL:
Thread Related Link Title:
  To "point" to an image (picture) from another website, provide the URL (Web Address) of the file ( include ONE reference to http:// )
Thread Related Image URL:

Date of your Birth:

Upload a Thread Related File:
File Types: Image (gif-jpg-png-bmp), PDF, Sketchup, Video (mov avi wmv mpeg mpg mp4 ogg). (Image Upload Tips)

I have read the Site User Agreement and agree with the Terms

  <= Check to receive e-mail notification of responses

Message Thread:

CNC plunging

2/14/19       
Alexi Member

Hi all hope ur having a great day

1-When nesting melamine boards should i plung cut? Knowing that i use pcd bit

2-I am having a problem when nesting some time a corner of a part will break knowing that i am cuting chipboard laminated panels

2/14/19       #2: CNC plunging ...
Tom Gardiner

Since you are using a pod and rail machine, I suggest you add a lead-in and don't start or finish on a corner. Ramps will leave flaws in melamine when the up cut portion of the compression bit enters the top face.

2/14/19       #3: CNC plunging ...
Alexi Member

Thank you for the tip
But i am using a flat table

2/15/19       #4: CNC plunging ...
Tom Gardiner

Small screen on my phone! I read PCD for pod. I always ramp in usually with a lead in. My software isn't very sophisticated as to the location of the start point so when it is critical I manually move the start point to midway on a straight vector and where I can get lead in room in the nest. Leads and ramps need not be very big .5" or so.

2/15/19       #5: CNC plunging ...
duster

Tom - what is the difference between a lead in and a ramp? I usually ramp in with melamine and other sheet goods to avoid stress on the bits and haven't had any edge quality issues.

2/15/19       #6: CNC plunging ...
Tom Gardiner

A lead in is a small vector added at an angle to the part's perimeter so the bit's entry is done off the edge of the part. It is automatically added when the option is selected. You can get a small defect on parts at the start/stop point due to machine deflection. Bigger machines are less affected.

2/15/19       #7: CNC plunging ...
duster

Ok, that makes sense. Thanks for the clarification Tom.

2/18/19       #8: CNC plunging ...
Stuart Douglas

We cut lots of Melamine sheet and I use a 3/8 compression bit for all the outlines. I plunge the cut to start, but only insofar as to get past the up-cut part of the compression bit. Then I ramp the rest of the cut. The plunge doesn't seem to leave any undesirable finish on the part, and seems to have no effect on the bit life. The ramp is there to allow the rest of the bit to enter the work without plunging the whole bit at once, and to save a bit of wear at the cutting height of the board thickness. If you try to plunge the whole depth, you will get some burning, which is bad news. Your PCD bit may need a lead in depending on the geometry of the bit. Most PCD bits look like the rake angle is not that far off from 90 degrees, and the upcut portion looks significantly longer than a typical carbide compression bit. We are using the Vortex 3130 and 3184, and the cost per bit, when bought in quantities of 20 or more, make this more economical than any of the PCD bits for our situation. I get about 60 to 80 sheets of nested base and upper cabinet parts, + misc plywood and PLam panels, per bit, per sharpening. I send them back to vortex and they come back like a brand new bit. Our local service didn't do so hot with the sharpening. Hope this helps.

2/21/19       #9: CNC plunging ...
Chuck Hicks Member

Website: http://www.southeasttool.com

I would always recommend ramping in where possible. Also remember a PCD bit will usually not run as high of feed rate as a spiral just due to it usually being on a shear vs the spiral. But in the right application will out last the spiral hands down. I would try the new coated bits that most of us have out.


View higher quality, full size image (1200 X 800)

2/21/19       #10: CNC plunging ...
Alexi Member

thank u all for ur great tips
i start ramping when nesting and my starting point not from any corner

i wish i could get coated bit but no one sell them in my country are they that good ??
i use to get carbide compression bit 2 fluts from here but they are made in china and and priced 30 usd and i get 5 to10 laminated chipboard per bit
and all my work is with chipboard boards

2/21/19       #11: CNC plunging ...
Chuck Hicks Member

Website: http://www.southeasttool.com

Coated bits are easily getting 30 to 40% more life than standard bits, some are getting a lot higher in certain applications.

2/22/19       #12: CNC plunging ...
Larry

We tried PCD and it wasn't worth it. I suspect the corner chipping is due to the use of the PCD. How many flutes? We now use the coated (Marathon) Leuco 2 flute compression, Get much better life when cutting HPL laminated board than with the non-coated bits. On melamine we get about 25% more life out of the coated bits. Well worth their minor increase in price. We are picky about the quality of cut so we can get good banding results. Our old bander doesn't have pre-mill.

2/23/19       #13: CNC plunging ...
Gerry

Chuck said "Coated bits are easily getting 30 to 40% more life than standard bits, some are getting a lot higher in certain applications. "

Am I correct in assuming that this benefit would be lost once the bit is sharpened?

2/25/19       #14: CNC plunging ...
Chuck Hicks Member

Website: http://www.southeasttool.com

Gerry,

Not completely, When we sharpen a coated bit, we only sharpen inside the flute, not on the Diameter, You do loose some benefit, but not all.

2/25/19       #15: CNC plunging ...
Larry

I made a mistake on my post about which bits we use. It should have said Onsrud Marathon. We use Leuco saw blades on our beam saw.

 

Buy & Sell Exchanges | Forums | Galleries | Site Map

FORUM GUIDELINES: Please review the guidelines below before posting at WOODWEB's Interactive Message Boards (return to top)

  • WOODWEB is a professional industrial woodworking site. Hobbyist and homeowner woodworking questions are inappropriate.
  • Messages should be kept reasonably short and on topic, relating to the focus of the forum. Responses should relate to the original question.
  • A valid email return address must be included with each message.
  • Advertising is inappropriate. The only exceptions are the Classified Ads Exchange, Machinery Exchange, Lumber Exchange, and Job Opportunities and Services Exchange. When posting listings in these areas, review the posting instructions carefully.
  • Subject lines may be edited for length and clarity.
  • "Cross posting" is not permitted. Choose the best forum for your question, and post your question at one forum only.
  • Messages requesting private responses will be removed - Forums are designed to provide information and assistance for all of our visitors. Private response requests are appropriate at WOODWEB's Exchanges and Job Opportunities and Services.
  • Messages that accuse businesses or individuals of alleged negative actions or behavior are inappropriate since WOODWEB is unable to verify or substantiate the claims.
  • Posts with the intent of soliciting answers to surveys are not appropriate. Contact WOODWEB for more information on initiating a survey.
  • Excessive forum participation by an individual upsets the balance of a healthy forum atmosphere. Individuals who excessively post responses containing marginal content will be considered repeat forum abusers.
  • Responses that initiate or support inappropriate and off-topic discussion of general politics detract from the professional woodworking focus of WOODWEB, and will be removed.
  • Participants are encouraged to use their real name when posting. Intentionally using another persons name is prohibited, and posts of this nature will be removed at WOODWEB's discretion.
  • Comments, questions, or criticisms regarding Forum policies should be directed to WOODWEB's Systems Administrator
    (return to top).

    Carefully review your message before clicking on the "Send Message" button - you will not be able to revise the message once it has been sent.

    You will be notified of responses to the message(s) you posted via email. Be sure to enter your email address correctly.

    WOODWEB's forums are a highly regarded resource for professional woodworkers. Messages and responses that are crafted in a professional and civil manner strengthen this resource. Messages that do not reflect a professional tone reduce the value of our forums.

    Messages are inappropriate when their content: is deemed libelous in nature or is based on rumor, fails to meet basic standards of decorum, contains blatant advertising or inappropriate emphasis on self promotion (return to top).

    Libel:   Posts which defame an individual or organization, or employ a tone which can be viewed as malicious in nature. Words, pictures, or cartoons which expose a person or organization to public hatred, shame, disgrace, or ridicule, or induce an ill opinion of a person or organization, are libelous.

    Improper Decorum:   Posts which are profane, inciting, disrespectful or uncivil in tone, or maliciously worded. This also includes the venting of unsubstantiated opinions. Such messages do little to illuminate a given topic, and often have the opposite effect. Constructive criticism is acceptable (return to top).

    Advertising:   The purpose of WOODWEB Forums is to provide answers, not an advertising venue. Companies participating in a Forum discussion should provide specific answers to posted questions. WOODWEB suggests that businesses include an appropriately crafted signature in order to identify their company. A well meaning post that seems to be on-topic but contains a product reference may do your business more harm than good in the Forum environment. Forum users may perceive your references to specific products as unsolicited advertising (spam) and consciously avoid your web site or services. A well-crafted signature is an appropriate way to advertise your services that will not offend potential customers. Signatures should be limited to 4-6 lines, and may contain information that identifies the type of business you're in, your URL and email address (return to top).

    Repeated Forum Abuse: Forum participants who repeatedly fail to follow WOODWEB's Forum Guidelines may encounter difficulty when attempting to post messages.

    There are often situations when the original message asks for opinions: "What is the best widget for my type of shop?". To a certain extent, the person posting the message is responsible for including specific questions within the message. An open ended question (like the one above) invites responses that may read as sales pitches. WOODWEB suggests that companies responding to such a question provide detailed and substantive replies rather than responses that read as a one-sided product promotion. It has been WOODWEB's experience that substantive responses are held in higher regard by our readers (return to top).

    The staff of WOODWEB assume no responsibility for the accuracy, content, or outcome of any posting transmitted at WOODWEB's Message Boards. Participants should undertake the use of machinery, materials and methods discussed at WOODWEB's Message Boards after considerate evaluation, and at their own risk. WOODWEB reserves the right to delete any messages it deems inappropriate. (return to top)


  • Forum Posting Help
    Your Name The name you enter in this field will be the name that appears with your post or response (return to form).
    Your Website Personal or business website links must point to the author's website. Inappropriate links will be removed without notice, and at WOODWEB's sole discretion. WOODWEB reserves the right to delete any messages with links it deems inappropriate. (return to form)
    E-Mail Address Your e-mail address will not be publicly viewable. Forum participants will be able to contact you using a contact link (included with your post) that is substituted for your actual address. You must include a valid email address in this field. (return to form)
    Subject Subject may be edited for length and clarity. Subject lines should provide an indication of the content of your post. (return to form)
    Thread Related Link and Image Guidelines Thread Related Links posted at WOODWEB's Forums and Exchanges should point to locations that provide supporting information for the topic being discussed in the current message thread. The purpose of WOODWEB Forums is to provide answers, not to serve as an advertising venue. A Thread Related Link that directs visitors to an area with inappropriate content will be removed. WOODWEB reserves the right to delete any messages with links or images it deems inappropriate. (return to form)
    Thread Related File Uploads Thread Related Files posted at WOODWEB's Forums and Exchanges should provide supporting information for the topic being discussed in the current message thread. Video Files: acceptable video formats are: .MOV .AVI .WMV .MPEG .MPG .MP4 (Image Upload Tips)   If you encounter any difficulty when uploading video files, E-mail WOODWEB for assistance. The purpose of WOODWEB Forums is to provide answers, not to serve as an advertising venue. A Thread Related File that contains inappropriate content will be removed, and uploaded files that are not directly related to the message thread will be removed. WOODWEB reserves the right to delete any messages with links, files, or images it deems inappropriate. (return to form)