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  1. #21
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    Quote Originally Posted by Milland View Post
    Large corncob body loaded with inserts? If it's a reputable brand, that's $800 easy for a "regular" cutter.
    Well still... I would not be using that for A36, especially if you can see flame cut 'bark on it.... 1/2" thick, throw a $30-40 solid carbide endmill in there...

  2. #22
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    I'll echo what everyone has been saying here.

    We run a part out of 2" a36. It is a block of steel about 10" square with a 3.5" hole through the middle.

    We used to get them with a 3" hole in the middle. But this is hell on tooling. Still need a rough endmill to get through the flame cut, before it can be semifinished and bored.

    Now, we get them with no hole in the middle. I drill a 1" hole through it, then use a 2" feedmill to helix down through it. It adds about 2 minutes of cycle time vs the old way. BUT the feedmill and drill last the whole job (100pcs at a time), and we save 5 or 10$ per part to do it without the hole.

    So I definitely see a reason sometimes to not put every hole.

    But aside from this job specifically, I usually want it close.

    If my part was stainless steel? I'd be BEGGING for the material to come with a 3" hole.

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  4. #23
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    Quote Originally Posted by Vancbiker View Post
    What answers did your machinists give you when you asked them? You did ask them didn't you?
    I am sure he asked them but didn't like their answers so he came here hoping to get an answer that he wants to hear.

  5. #24
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    Quote Originally Posted by AJT View Post
    As the title describes, recently a couple of machinist have decided that they do not want parts with precut lead holes from our CNC cutting tables. Instead, would rather start any hole of any tolerance from scratch with a center drill or centercut endmill.

    I have inspected the parts off the table and found nothing out of tolerance and have only been told its "easier" to start with a blank. From a time perspective, I cannot understand why you would want to start with a blank plate every time. For example, laser cutting a 3.25" lead hole in 1/2" A-36 to be finished at 3.505" would take significantly less time than roughing in one on a VMC from scratch.

    Can someone give me some clues as to why you would want a blank plate every time?
    Quote Originally Posted by Fancuku View Post
    I am sure he asked them but didn't like their answers so he came here hoping to get an answer that he wants to hear.
    Fancuku, how did you come to that conclusion??

    Sure sounds to me like he was asking an honest question. Hopefully he's come back to see the responses for/against a rough start hole...

    edit: Also worth a mention IMO that if you ask 10 machinist how to do something you will get 12 different answers...

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  7. #25
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    Quote Originally Posted by Mike1974 View Post
    Also worth a mention IMO that if you ask 10 machinist how to do something you will get 12 different answers...
    Four out of five voices in my head agree with you........

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  9. #26
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    Quote Originally Posted by Mike1974 View Post
    Well sheesh?! Don't use diamond or ceramic or pcd for A36 then!!
    Quote Originally Posted by Mtndew View Post
    What end mills are you buying that cost $800?
    Quote Originally Posted by Mike1974 View Post
    Well still... I would not be using that for A36, especially if you can see flame cut 'bark on it.... 1/2" thick, throw a $30-40 solid carbide endmill in there...
    If I need to peel a contour down 4-5" deep, Ill use a 1" long reach 6 flute coated endmill. I keep an old one for roughing, and a nice one for finishing.
    Those suckers cost a lot in Canadian microbucks.

    Thin stuff you can reach with small cheap cutters, yes, cheap 1/2" endmill.

  10. #27
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    Quote Originally Posted by ChipSplitter View Post
    Four out of five voices in my head agree with you........
    A large number of them do the same job another way each time for some odd reason, I like to find a way that works and keep doing it the same each time but that does not seem to be the norm.

  11. #28
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    Quote Originally Posted by macds View Post
    If I need to peel a contour down 4-5" deep, Ill use a 1" long reach 6 flute coated endmill. I keep an old one for roughing, and a nice one for finishing.
    Those suckers cost a lot in Canadian microbucks.
    Ahh Canada.
    That's still a lot of money for a 1" 6fl long reach ($600USD). I assume it's necked?
    We get a lot of our end mills made by our resharp company, I'd wager a guess a 6fl necked end mill from them would run around $300USD since that's how much their 4fl are. And that's $400 Canadian.

  12. #29
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    Quote Originally Posted by Mtndew View Post
    Ahh Canada.
    That's still a lot of money for a 1" 6fl long reach ($600USD). I assume it's necked?
    We get a lot of our end mills made by our resharp company, I'd wager a guess a 6fl necked end mill from them would run around $300USD since that's how much their 4fl are. And that's $400 Canadian.
    I think you should telll me about your resharp company.
    Keep in mind, our Canuckistan tooling vendors buy from the states, tack on their 30%, then I pay for the shipping, and then 15% tax on it all....

    Ah yes, the competitive advantages of overpriced supplies, electricity, materials, and a 60% effective tax rate. Sorry for the rant.

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  14. #30
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    Quote Originally Posted by macds View Post
    I think you should telll me about your resharp company.
    Ours is Progressive Cutter Grinding out of Shelby Township, Michigan.
    It seems their website is down,but here is a link to their Facebook:
    PCG: Progressive Cutter Grinding - Home | Facebook

    I'm trying to attach a picture like the hundreds of times I have before, but it's not cooperating right now.

  15. #31
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    Let's see if this uploads
    Attached Thumbnails Attached Thumbnails pcg.jpg  

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  17. #32
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    Wow, I dont know if I could buy blanks up here for that price.

    Thank you kindly for sharing.

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  19. #33
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    Quote Originally Posted by Fancuku View Post
    I am sure he asked them but didn't like their answers so he came here hoping to get an answer that he wants to hear.
    I asked them, said its "easier". I wanted to know why its easier and its more efficient for me to post a thread here and read it home than stopping our work flow to discuss it, or hold them after they've worked in 100 degree heat all day. On the topic of things, I'd like to hear, your snoddy remark would be 3 places lower than my doctor diagnosing me with cancer.

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    Quote Originally Posted by AJT View Post
    I asked them, said its "easier". I wanted to know why its easier and its more efficient for me to post a thread here and read it home than stopping our work flow to discuss it, or hold them after they've worked in 100 degree heat all day. On the topic of things, I'd like to hear, your snoddy remark would be 3 places lower than my doctor diagnosing me with cancer.
    Welcome!!!

    pm.jpg

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  22. #35
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    Quote Originally Posted by AJT View Post
    I asked them, said its "easier". I wanted to know why its easier and its more efficient for me to post a thread here and read it home than stopping our work flow to discuss it, or hold them after they've worked in 100 degree heat all day. On the topic of things, I'd like to hear, your snoddy remark would be 3 places lower than my doctor diagnosing me with cancer.

    I have a feeling you got that answer for a reason. Dont take that the wrong way now...
    Are you a machinist, or have experience making parts?


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