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Type: Posts; User: Jim27

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  1. making small adjustments for tool dimensions - in CAM or on the mill?

    Looking for some input on this. For example when milling a hole size for high accuracy or using a radius end mill and wanting good blend with pocket and top of material. I realize in the latter...
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    Re: WW collet - cutter is pulling out of collet

    I reduced DOC to 1/16, used a slightly shorter bit, tightened everything up and it ran smoother and without pullout. BTW, running 16"/min. Need to set up a vacuum brush to keep the chips up and...
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    WW collet - cutter is pulling out of collet

    Have a servo products desktop CNC mill with WW collets. Have done some milling of aluminum and even a bit of steel (not much and very light cuts) and haven't noticed this issue. Routing some cherry...
  4. Re: How much to torque ww collets? Having some slipping...

    Found some torque specs and manual. The drawbar has a philips head screw and a 7/16 hex. The recommendation is to use the philips drive to tighten to avoid over torque. It says the hex is ok but...
  5. How much to torque ww collets? Having some slipping...

    Having some trouble with straight flute router bit gradually pulling out of the WW collet on my Servo Products desktop mill (1980's vintage :)). 1/4" collet with 1/4" bit cutting cherry wood. It...
  6. Re: How to intentionally make slightly rough surface for better part grip?

    Another possibility is bead/shell/sand blasting. The material is 4140 PH so shell blasting isn't likely to do much but maybe some other blasting. The shop that made some embossing dies for text...
  7. How to intentionally make slightly rough surface for better part grip?

    Making a drawing die with more curves on one side than the other so thinking about how to keep the blank from pulling to that side. I do have a way to clamp the sheet metal to the face of the ram...
  8. Carbide tipped reamers not available under about 0.1875"?

    Doing some work in 4140PH and need to ream some holes. I found carbide tipped reamers for the holes around 0.25 and larger no problem. Not finding them for around 0.125". I am finding solid...
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    Cobalt tools for 4140PH?

    Wanting to get some advice in using cobalt tools in 4140 and 4140 PH. Mainly interested in the PH as the other should be easier. Have some cobalt drills and will be running them on a machining...
  10. Re: Ball or corner radius end mill for shallow face contours?

    Found this page that deals with wood routing but the basics are the same. Shows radius end mill is much better for low slopes with milling path up and down the slope. ...
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    Re: Edge finder for small diameter.

    1/4" edge finders are scarce but I found one at Shars and ordered it a few months ago for a small cnc mill.

    https://www.shars.com/fisher-machine-model-250-1-4-single-end-edge-finder
  12. Re: Ball or corner radius end mill for shallow face contours?

    You are talking of polishing on the sides of the punch? I can do that and good to know but that's not what I am asking about. The face of the punch will be flat so no issue with milling that. The...
  13. Re: Ball or corner radius end mill for shallow face contours?

    I probably didn't explain it very well. I just found this page that talks about the subject although their presentation and calculators could have been clearer IMHO. ...
  14. Re: How to set up air blast for dry milling on maching center?

    Maybe coolant is the way to go. I have just read some on carbide thermal shock from coolant but have really no experience to base that on one way or the other. I suppose it is a case of flood with...
  15. Re: Ball or corner radius end mill for shallow face contours?

    It's a punch for 0.027 aluminum "coil stock" that is fairly soft. Wanting to vary the height around the lip of the female die section to reduce force needed. Thinking about 3 - 4 times material...
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    Re: Dowel hole reaming sizes, etc?

    Thinking the plates will be hard to separate. I could push the pins out one at a time and then put them back but it sounds like you are suggesting leaving them in the base and slipping the movable...
  17. Ball or corner radius end mill for shallow face contours?

    For machining a sheet metal punch I plan to put some taper on the face to reduce force needed. Overall size is 8 x 8 Since it's a shallow taper - about 0.1" in 4" - I am wondering if a corner radius...
  18. Re: Pls give me some feedback on my drawing die plan...

    Appreciate the responses but that is all really basic stuff I already know. I posted what I had for a press in my first post. The press is very basic but what I plan to use. A way to apply...
  19. Re: Pls give me some feedback on my drawing die plan...

    I need to figure out a good way to apply blank holder pressure and be able to lift it for clearance to insert the blank and hoping for some ideas from others here. I have seen a second cross beam...
  20. Re: Pls give me some feedback on my drawing die plan...

    The thin plate between the die and blank holder locates the blank and also functions as a standoff to set the clearance of the blank holder. I am planning to use fixed clamping pressure instead of...
  21. Pls give me some feedback on my drawing die plan...

    Working on a low volume (few hundred maybe) gutter end cap for an 8" commercial gutter profile. Will use 4140PH for upper and lower die and 4140 annealed for the rest. Depth is 1/2". Material is...
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    Re: How to polish drawing dies after milling?

    I have seen processes where a hardened ball is pressed though an aluminum or similar soft metal part to get a smooth and accurate size for a bearing or bushing. Very simple process using only a...
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    Re: How to polish drawing dies after milling?

    I have seen CNC polishing a few places. Seems like that might be a good way to do it although for my case the direction would be perpendicular to the metal flow direction. Maybe do that and then do...
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    Re: How to polish drawing dies after milling?

    I have a radius at the top of some plates and some small corners. Think a rectangular box with radius corners and a radius at the top edge. So I will need some round stones - they seem to come in a...
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    How to polish drawing dies after milling?

    What sort of tools and grits should I get for polishing 4140PH after milling for drawing dies? What are reasonable grit steps? Irregular shape with some 0.200" radius corners but overall opening is...
  26. Re: How much offset on waterjet cuts to clean up with milling?

    Not familiar with what a "billeting facility" is. I asked about getting the drops cut - they do cutting but said the drops are only available as is - no cuts. They also have a 100 lb minimum but...
  27. Re: How much offset on waterjet cuts to clean up with milling?

    Thanks Peter but I will be doing the milling myself. Can't justify the cost of sending out all the work as it's for a hobby business and it's a challenging project I want to do. Was just looking at...
  28. Re: tips for milling pockets in 4140PH with small end mills?

    I see. I was thinking the step down would be over a short distance but I see it is over the whole path.
  29. Re: tips for milling pockets in 4140PH with small end mills?

    It's a somewhat irregular shape but has flat sides of about 8" on two sides, 4" on one, and an irregular shape on the other. I would think the ramp would best be done on a long straight side if for...
  30. Re: tips for milling pockets in 4140PH with small end mills?

    Bridgeport 2216
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