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Type: Posts; User: Pete F

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  1. Replies
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    Yes I've done something similar with 4140, both...

    Yes I've done something similar with 4140, both as studs threaded on each end and as bolts. Both began as standard round stock. I single pointed these, but 4140 should be able to be threaded with a...
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    Hand taps are very likely to break in that type...

    Hand taps are very likely to break in that type of head. They're meant to be driven by hand, hence the name. It's likely a decent clutched head could drive them ok, but I don't believe it's...
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    FWIW Bill, I bought my Tapmatic heads through US...

    FWIW Bill, I bought my Tapmatic heads through US ebay. I recall exactly what I paid, but do remember they were both pretty good deals and I agree with Matt, if you don't mind used, ebay could be your...
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    Bill keep in mind you'll also need a set of...

    Bill keep in mind you'll also need a set of specialised taps to go with your head. I use spiral flute ones, but it's up to you which you use, but hand the hand taps we normally used are designed to...
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    G'day Charles, obviously I can only comment on...

    G'day Charles, obviously I can only comment on what you write, hence why members are encouraged to fully describe (with pictures where possible) the actual nature of the problem. This is a classic...
  6. Thread: Weld rotator

    by Pete F
    Replies
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    11,146

    A stepper and a DC motor are essentially the same...

    A stepper and a DC motor are essentially the same in regard an overload condition, and why I didn't want to get too much into missed steps, stalling, etc. If a DC motor is loaded it will slow down,...
  7. Thread: Weld rotator

    by Pete F
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    What I went on to say was: "The two main reasons...

    What I went on to say was: "The two main reasons I suggest them is because the speed can be determined regardless of load, that could be a factor with a table that is anything other than horizontal....
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    Ok, well both are not great choices for your...

    Ok, well both are not great choices for your application, will cost you an arm and a leg ... and a citizenship because McMaster-Carr won't sell to Australia. All part of the Patriot Act in the land...
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    I like the way he stores them outside to...

    I like the way he stores them outside to accentuate the patina.

    Hmmm, 250 bucks for a rusty 3 phase POS. $300 for a brand new single phase one from Hare and Forbes you can plug in to any GPO....
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    Ha ha, yes I also had Series 3 Land Rover when I...

    Ha ha, yes I also had Series 3 Land Rover when I lived in Arhnemland. Fortunately the totally crap original engine had been replaced with an almost as tragic Holden engine so I didn't need to contend...
  11. Thread: Weld rotator

    by Pete F
    Replies
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    11,146

    How hot they get will depend on the voltage...

    How hot they get will depend on the voltage they're being driven by. A higher voltage will increase the power (and holding torque, though that's not relevant here), while a lower voltage will...
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    4140 and O1 are completely different steels. Out...

    4140 and O1 are completely different steels. Out of interest what ere you using this for?
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    ... and leaking. Don't forget the leaking ;)

    ... and leaking. Don't forget the leaking ;)
  14. Thread: Weld rotator

    by Pete F
    Replies
    37
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    11,146

    A weld positioner will have very little load on...

    A weld positioner will have very little load on the motor, basically just friction and enough torque to turn an eccentric piece if you build one that can also be angled. Small stepper motors to suit...
  15. Thread: Weld rotator

    by Pete F
    Replies
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    11,146

    Michael these days I wouldn't bother with a DC...

    Michael these days I wouldn't bother with a DC motor at all. It's far too limiting and may be fine if all you want to do is spin something at a constant speed, but it's not the way I'd go.

    Stepper...
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    Yes I've done turning on through hardened steels,...

    Yes I've done turning on through hardened steels, though don't think I've ever done a bore. Do a search here for hard turning as I know I put up some posts on it. I would probably use a Cermet insert...
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    I guess that would depend on the length you want,...

    I guess that would depend on the length you want, but I have about 50 or so keys in 3/5/6 mm of various lengths and they all have rounded ends. Indeed generally that's how they're supplied if you buy...
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    Buy keys with rounded ends

    Buy keys with rounded ends
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    Ok, cool! Thanks. Oh I forgot, the third thing...

    Ok, cool! Thanks.

    Oh I forgot, the third thing I've wanted is a laser receiver to attach to the dipper. Super handy but very expensive considering what they are. Unlike a regular receiver they...
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    Yes but you said it was a piece of aluminium you...

    Yes but you said it was a piece of aluminium you were drilling right? If this is consistent and not just a one off, take a piece of the same stock and hang it out the front the same amount. How true...
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    So that's basically a ripper with teeth on it? ...

    So that's basically a ripper with teeth on it?

    The two attachments I would like to have would be a thumb and a ripper, both are not exactly rocket science to make, but it's all a matter of time....
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    The aluminium would have to be awfully crap to...

    The aluminium would have to be awfully crap to not be essentially homogenous (for our purposes) through the entire length.

    As I said above, I think a lot of people are chasing a furphy here. Take...
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    Here's some photos of what I was doing if anyone...

    Here's some photos of what I was doing if anyone is interested in putting pictures to words. I cut quite a bit of the stump apart but just needed to get it out the way so I could do the groundwork...
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    Yes my little excavator is only 1.6 Tonnes and...

    Yes my little excavator is only 1.6 Tonnes and just doesn't have the umph to rip through thick roots. A big excavator can make a real mess when it pushes stuff over as the roots will get pulled up....
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    A new spindle! Holy cow, I don't think so. This...

    A new spindle! Holy cow, I don't think so. This is a very common thing to happen, and unless it's been stored at the bottom of the Dead Sea for the past 30 years, the tapers will unlock when...
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    The jackhammer was going to be my next trick to...

    The jackhammer was going to be my next trick to try so good to hear it's viable, thanks Bob. There are wide jackhammer bits used for removing tiles etc, I have one (though never seem to be able to...
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    I wouldn't hold it in a vice, it will shrink the...

    I wouldn't hold it in a vice, it will shrink the spindle and defeat the purpose. The spindle has a step and use that instead.

    I can't imaging MAPP would damage the spindle, it either gets hot or...
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    I was wondering about those carbide chains Peter....

    I was wondering about those carbide chains Peter. I've never used them and wonder how they're sharpened? Or aren't they?

    I find the recipro saws blunt also, I use them a lot for this type of...
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    Yes that's what I did last time, but it was more...

    Yes that's what I did last time, but it was more to get the stump light enough to be able to carry with the excavator and lift on to the ute. I pressure washed about 1/2 tonne of the roots...
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    Chainsawing dirty wood

    Not strictly metalworking, but as it involved endless filing of chainsaw teeth and I know a number of people here would have been in this situation, thought I'd ask here.

    Does anyone have any good...
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    What RC said, if a hammer doesn't work, either...

    What RC said, if a hammer doesn't work, either press it out or use a bigger hammer. If it won't press out, use a bigger press.

    If the drawbar is screwed in loosely but not tightened you shouldn't...
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    I appreciate the issue has been solved for the...

    I appreciate the issue has been solved for the moment Brian, but I'm curious for my own experience the answer to my above question as to whether the stock was fully inserted in the chuck or sticking...
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    Brian you've had some very good advice but I'll...

    Brian you've had some very good advice but I'll throw something completely different out there. Did you have the stock extended from the chuck and running true, or back in the bore of the spindle? To...
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    The ones I saw definitely weren't that expensive,...

    The ones I saw definitely weren't that expensive, but can't recall the price. I guess there are different versions and it may be possible to find a cheaper version.
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    Go to a site like Aircraft Tool Supply or...

    Go to a site like Aircraft Tool Supply or Aircraft Spruce, both in the US. They sell complete kits or individual rivet sets very cheaply and are used to shipping worldwide. I personally use ATS, but...
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    Richard I've swapped to Nitto and find them much...

    Richard I've swapped to Nitto and find them much better. Higher flow than the old ones. I often stock up on genuine Nitto brands from Field Days, as they're often so cheap as to be a no-brainer. The...
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    Yes they sometimes spring back, as will any...

    Yes they sometimes spring back, as will any material that is below it's yield point. They also often don't spring back, and it's why some bars cost 10 times what other do! You'll often see...
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    Whichever was the cheapest steel they could buy...

    Whichever was the cheapest steel they could buy on the day.

    There is absolutely no way of knowing what type of steel was used, short of writing to the manufacturer (good luck) or having a...
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    Nice work Bob. Lots of ways to skin that cat...

    Nice work Bob.

    Lots of ways to skin that cat and you did well. Line boring would be the ultimate for accuracy. I'll throw another out there for what it's worth.

    Chuck in a 4 jaw (faceplate if...
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    Use the same indicator you use to indicate...

    Use the same indicator you use to indicate anything else. There is no special "scraping indicator".
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    If your hands are really dirty, oily, or greasy...

    If your hands are really dirty, oily, or greasy the best thing is more oil, as strange as it sounds. I keep some baby oil that I use for this type of thing. It won't harm your hands (in fact it will...
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    Enco. They don't exist any more. Just Google a...

    Enco. They don't exist any more. Just Google a supplier here or buy through Amazon.
    ...
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    Agree, the blades are available in various...

    Agree, the blades are available in various thicknesses and the appropriate one will depend on how beefy the thread is you're making.

    What I like about that design is being able to reverse the ...
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    I use a Norton fine slip stone, before that I...

    I use a Norton fine slip stone, before that I used a fine diamond stone. It doesn't matter what you use really, just as long as it's relatively fine and you don't over stone the work. The ideal would...
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    Here's some blades for sale if you want to scoop...

    Here's some blades for sale if you want to scoop some up. https://www.ebay.com/sch/kooltools63/m.html?_nkw=&_armrs=1&_ipg=&_from=
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    I just checked various combinations of Whitworth,...

    I just checked various combinations of Whitworth, metric and UNC in 1.5 mm and 16 tpi and take back part of what I said here. The difference between 1.5 mm and 16 tpi should be enough that it should...
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    G'day John. The bolt you checked is Whitworth...

    G'day John. The bolt you checked is Whitworth (presumably checked with a Whitworth thread gauge), the thread I'm suggesting is UNC, the thread gauges are not the same.

    The pitch between a...
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    I believe it's from a now defunct US toolmaker...

    I believe it's from a now defunct US toolmaker DTM. The advantage of this type of holder is the blade will last a VERY long time before needing to be replaced. It also can be tilted to the left and...
  49. Thread: Reamers

    by Pete F
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    2,220

    One will chatter, be temperamental, and just...

    One will chatter, be temperamental, and just generally make your life miserable in anything even remotely difficult to machine. The other will produce a round and clean hole. I'll leave you to guess...
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    Further to the above, I just ran the figures for...

    Further to the above, I just ran the figures for a 30 mm x 16 tpi thread, and that "new" adaptor is absolutely smack on for a 16 tpi thread at 6g. The minimum 3 wire measurement would be 30.46 mm and...
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