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Type: Posts; User: QuinnSjoblom

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  1. Replies
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    Interesting, sounds like just typical internet...

    Interesting, sounds like just typical internet misinformation then. When researching I found a couple instances of guys mentioning orienting parts in 6al4v along grain for best rigidity. Good to know...
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    I'm not actually sure. I purchased the current...

    I'm not actually sure. I purchased the current sheet I have on eBay because it was a great deal. It is listed as vsmpo, ams 4911 and grain direction is labeled. Does ams 4911 tell the whole story, or...
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    some questions about 6al-4v

    Ive been making folding knives from 6al-4v titanium (the handles) and i want to learn everything i can about how to best handle the material. I havent had any major problems, but theres a few things...
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    Re: Prepping titanium stock

    it looks like ill eventually be sending out for waterjet. Found a local guy 2 miles down the road and its not gonna cost more than a few bucks per part. Also it looks like a bandsaw isnt too terrible...
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    Prepping titanium stock

    I need an ongoing supply of 6al-4v stock pieces that are roughly 1/4" thick, 1-1/4" wide, 10-1/2" long. Probably about 20 pieces per month for now. Since titanium generally only comes in sheets, I've...
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    Yeah, I've been checking ebay weekly for months...

    Yeah, I've been checking ebay weekly for months and it seems like a decent used tester is approaching 1000 bucks. I've seen that ames tester a few times but I think 700 is the lowest I've seen. I'm...
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    Rockwell hardness testing

    I'm a knife maker that would like to be able to test my blade hardness. I already have a set of files for getting within 5 points or so hrc but that's just not accurate enough. I've been searching...
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    Re: taper reaming

    Yep, its ground from a carbide shank, broken endmill works fine. The term D-bit comes from the cross section of how its ground. if looking at the end of the tool, it looks like a "D". The shank is...
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    Re: taper reaming

    mactec, You're probably right. Yes its extremely short, 0.130" deep, 0.25" diameter at top. It would be a very short rigid tool so i probably dont need multi flute stabilization that a reamer would...
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    Re: taper reaming

    kitten, yes, grinding with air spindle after heat treat would give the ultimate finish and accuracy. Couple issues with that in my case. My 4th will not tilt, i have a custom built mill/turn setup....
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    yes, of course a hss reamer would not work in...

    yes, of course a hss reamer would not work in 60hrc material. i think you skipped over the post from mactec that i was responding to. hss reamer would be for pre heat treat, then lap afterwards.
    ...
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    Re: taper reaming

    yes, an angle similar to a traditional tapered pin would be about impossible to not get stuck, but at 10:1 its about 5 times more taper than that. Again, it will also only be pushed in with hardly...
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    Re: taper reaming

    I didnt really consider lapping since its a taper, but maybe that would be a good option for machining pre heat treat. Keep in mind this is a relatively shallow taper at 10:1. Ive searched all over...
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    Re: taper reaming

    I guess i shouldnt have said "turned". I meant the tapered hole could be bored on lathe if it absolutely had to be. Yes, the male taper part will be turned on lathe no matter what and i understand...
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    taper reaming

    im working on a design that will need a very precise tapered hole in hardened steel, 58-60hrc. Doing it pre heat treat is definitely an option, but i would prefer to do it after if possible for best...
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    Re: 1095 warping

    sounds good. I did have better luck on the second attempt after removing both surface skins. Im currently building a heat treat oven for hardening my blades so i will add stress relieving to the...
  17. Re: Strange harmonic machining pattern pattern

    is this a home built machine with cheap ballscrews? mine had the same until swapping out to high quality screws that werent warped. The alternating pressure of the warped turning screw on the nut was...
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    1095 warping

    trying my hand at folding knives. the titanium scales went excellent, parts are perfect. eventually will do blades from cpm 154 but i thought i would try some cheaper 1095 first. my blade stock is...
  19. Re: could this setup work for regrinding my bt30?

    I sent off a couple emails looking for recommendations. Looks like a pretty basic aluminum oxide abrasive with 60 or so grit will do fine. I see that there are many mounted points that i could buy...
  20. Re: could this setup work for regrinding my bt30?

    Ok thanks, ill check it out. Im not too worried about abrasive type. Probably more important if you want to grind many parts with decent tool life and a reliable process. I only need to take a few...
  21. Re: could this setup work for regrinding my bt30?

    I was assuming if anything, faster than 24k would be better, no problem to go slower if thats where it needs to be. Keep in mind, this grinding wheel is only gonna be 1/2 to 5/8 on diameter to have...
  22. Re: could this setup work for regrinding my bt30?

    I guess pic didn't make it in. Heres my old z axis i wamt to fixture on machine to grind with
    459698
  23. could this setup work for regrinding my bt30?

    A blue test shows pretty clearly that there is good contact for about the bottom half of my bt30 taper and fading to no contact at all towards upper half. Checking with blue was done with a few...
  24. Machining sleeve to get perfect tool runout in cheap toolholder and collet

    I have what i would call a hobby grade bt30 spindle and cheap toolholders. I would say comparable to tormach stuff. My spindle has probably about 5 tenths runout at 4 inches from nose. My toolholders...
  25. Re: Calculating max acceleration of z based on servo torque

    Cool, I'll check it out. Most likely go with 400watt, dmm rep is telling me that it should be more than plenty.
  26. Calculating max acceleration of z based on servo torque

    Upgrading my z axis to servo since it just gained a lot of weight with the new spindle setup. Z axis is roughly 70lb, driven by a 5mm pitch screw. Im wondering if a 400watt servo is going to give me...
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    Re: Planing Aluminium and steel

    For the aluminum, have you considered buying tooling plate? Atp 5 or mic 6. Its cast aluminum Blanchard ground to precise thickness and flatness, im assuming at least to the level of accuracy you...
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    Re: distortion of steel when machining

    After doing some math, there was only a slight advantage of replacing the center of the pulley with an aluminum hub. About 90% of the inertia is carried in the outer inch or so of radius, so i just...
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    Re: Designing servo driven bt30 setup

    That will be a great setup for ripping up aluminium. Rigid tapping is nice to have if you need to get through a lot of threads quickly, but otherwise thread milling is great. I never used to do it...
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    Re: Designing servo driven bt30 setup

    The chinese spindle will work great. I considered the same since i also have one, at least temporarily. If you gear it down 2:1 for 12k max, it will do pretty well at general machining with excellent...
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