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Type: Posts; User: dian

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  1. Replies
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    van der waals is 170 pm (if the source i quoted...

    van der waals is 170 pm (if the source i quoted above is correct). whats the difference? 1:2.5 ratio.

    as i understand it covalent is the distance of the protons in a grid. v.d.w. is looking at a...
  2. drills are so complicated that its a surprize...

    drills are so complicated that its a surprize they work at all. books and dissertations have been writtenon the subject (e.g. prof. hugel).

    as to the rush grinders, they look like you really need...
  3. it is conical with the axis offset.

    it is conical with the axis offset.
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    no idea what drills you guys are getting. my...

    no idea what drills you guys are getting. my holes are more often too small than too big. and the finish? what do i care?

    thunderjet, out of curiosity, your "45° spotter" is 90°, right?
  5. dont forget GDW.

    dont forget GDW.
  6. such a cutting speed table is pretty much useles....

    such a cutting speed table is pretty much useles. cutting speed mainly depend on hardness. cast irons have a hardness between 100 and 500 hbn. you adjust the speed proportionally (roughly). no idea...
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    can you point me to some info on that?...

    can you point me to some info on that? electrolytic or electroless?

    (i dont think it would work on a diamond blade, though.)
  8. "The idea is that the machine would be for the...

    "The idea is that the machine would be for the people who aren't skilled enough to do it by hand so they don't have to keep asking the people that CAN do it for help."

    biggest problem with drill...
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    a drill that is too sharp is bad, especially when...

    a drill that is too sharp is bad, especially when hand feeding.
  10. im surprized epsom salt has not been mentioned. ...

    im surprized epsom salt has not been mentioned.

    btw, hooking up battery to welder (ac) didnt help. it killed it, if i remember correctly.
  11. batteries are getting expensive and charging...

    batteries are getting expensive and charging devices even more so. whats the point of paying several times the price of a battery? and even then they will recover a batterey in certain instances...
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    the wheels look like cast magnesium bbs. have...

    the wheels look like cast magnesium bbs. have them on a car.
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    i would use conctete aggregate.

    i would use conctete aggregate.
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    i find a tapping head not so usefull, btw. i use...

    i find a tapping head not so usefull, btw. i use a set of "tapping inserts", one for every size and the mill does the reversing. i can really rely on the torque setting without having to mess with...
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    yes, thre are several different (types of?) radii...

    yes, thre are several different (types of?) radii reported for ellements, i dont understand the difference. but usually they are not that far off. surprisingly most ellements are 120-250 pm. e.g. i...
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    out of curiosity: what is the component for? some...

    out of curiosity: what is the component for? some electrical application? does grain size matter?
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    i belive that threads do center. they center on...

    i belive that threads do center. they center on the pitch diameter cylinder. the problem arises when the surface is not flat. on first thought a pointed gage should produce little distortion. second...
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    How to make a torque limiting tap head...

    How to make a torque limiting tap head

    look on youtube as well.
  19. Replies
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    atomic radius of carbon is around 0.170 nm. how...

    atomic radius of carbon is around 0.170 nm. how does 0.1 nm work? you cant grind the atom, right? btw, i assume carbon doesnt produce a burr. would be hard to get rid of it at these dimensions.
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    what might be the edge radius of the "diatome"...

    what might be the edge radius of the "diatome" knive?
  21. so lets say you want to put a centered feature in...

    so lets say you want to put a centered feature in the centre of round stock.

    1. put it in the vice and center it on the table by eye.
    2. put an indicator on the quill (or table or anywhere else)...
  22. an old boy-scout tric to keep a fire going is to...

    an old boy-scout tric to keep a fire going is to place logs on a tilted stand. maybe the same applies here for round stock?
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    this? this?

    this? this?
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    a brale/penetrator has a tip radius of 0.2 mm.

    a brale/penetrator has a tip radius of 0.2 mm.
  25. Thread: Mo Max...

    by dian
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    swiss/screw machine shops still have a need for...

    swiss/screw machine shops still have a need for hss bits.
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