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Thread: What did you learn today?
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6th Jun 2020, 05:54 PM #811Senior Member
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This might be operator error
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6th Jun 2020, 07:09 PM #812Senior Member
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- Apr 2014
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- Perth
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6th Jun 2020, 07:10 PM #813Most Valued Member
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What did you learn today?
Preposterous!! Next you'll be telling me that the dark blue chips should have been an indication it was working a touch hard....
Yup - 100% operator error for sure!
I'll add that it was an interesting situation at the time.
My first thought was "wow - that would make a cool photo"
Then "what the hell do I do now? If I hit the E-stop then the spindle will stop and the cutter will be fusion welded to the work forever...."
I decided to just kill the feed, leave the spindle running and drop the knee to get it out of the work.
Workpiece is recoverable
Steve
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6th Jun 2020, 08:41 PM #814
Hi Steve, Guys,
Did that hit something hard in the material ?Best Regards:
Baron J.
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6th Jun 2020, 10:34 PM #815Most Valued Member
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I don’t think so John.
Material is a bit of forklift tyne.
500 RPM at 80mm/min feed full width cut but only about 4mm deep. I’d just finished a 10mm deep pass full width and a couple of half width with no issues.
I honestly think it just went dull and with no coolant it just went from dull to blunt to red hot and plastic due to friction heat.
If it was being manually fed then you’d notice the change but 2kw power feed and 3kw spindle didn’t feel a thing....
Steve
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7th Jun 2020, 09:05 AM #816Philomath in training
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- Oct 2011
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- Norwood-ish, Adelaide
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A 20mm cutter in MS should be run at less than 450rpm, if cutting alloy steel about half that (forklift tyne is likely to be a steel alloy).
Overspeed will heat and destroy cutters really quickly.
Michael
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7th Jun 2020, 10:58 AM #817Most Valued Member
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Thanks Michael. I need to remember that I’ve got the FSWizard app on my phone that takes the guesswork out of it (pretty much what I’ve been doing).
I just threw the values in and it came out at 280rpm and 40mm/min feed.
It’s one of the HSS roughest I got from Magpro (M&G) so fair to say I think they must be reasonably quality to hold up as well as it did running at twice the recommended speed and feed.
Steve
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7th Jun 2020, 11:23 AM #818Most Valued Member
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- Jul 2006
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- Athelstone, SA 5076
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being a fridgie we used vacuum pumps all the time. less than 500 microns is the goal.
although we could get so called "vacuum pump oil" we, the industry, generally just used refrigeration oils of the viscosity of 68 or 46 AC guys used 68 while commercial refrig guys used 46 as that is what those industries generally used to run with the industry specific refrigerants...used to be mineral oils but now synthetics.
can get it in small quantities from any refrigeration wholesaler...can even get "Vac Pump" oil in smaller quantities.
the trick to get low vacuums is to change oil oil, then change again and then again. ..while breaking vacuum with dry nitrogen...and in the event of not having nitrogen break the vacuum with air. No not Oxygen...Air, plane old atmospheric airt....and preferably not on a rainy day...then evacuate again, repeat and evac again.....one only generally did this to suit prove to the Consultant the system was DRY.
and automotive oils engine (or steering pump oils) are not the go......they are not dry....the ppm of moisture is too high and will prevent pump from its ability to pull low vacuums..... their acidic values is also too high and are contanminated with cleaning additives...he was obviously a rough fridgie and didnt care about the vacuums he should have been obtaining...ie 500 microns or better
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7th Jun 2020, 07:05 PM #819Diamond Member
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- Oct 2008
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7th Jun 2020, 10:41 PM #820Golden Member
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- Nov 2010
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- Gippsland Victoria
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- 733
Ball turner from rotary table
Saw a clever trick on the homemadetools forum a while back. Might be handy for someone.
A ball turner for lathe made by mounting the rotary table from the mill on the cross slide of the lathe. Nice bit of thinking.
Video here https://www.facebook.com/dwight.belt...14500798814834
Bill
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30th Nov 2020, 01:43 AM #821Diamond Member
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- Feb 2013
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- Laidley, SE Qld
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Spring wire / music wire / piano wire
I bought 2 x 1 lb rolls of music wire, 1.4mm and .8mm to make some springs. The packaging is well thought out so that the coil of wire remains contained/restrained safely in the box and the required wire can be drawn from the centre opening. Four notches are provided around the centre opening as rests for the cut end.
What I learned today is that if you don't have enough length of cut end sticking out and it slips back in the box you are screwed, it is impossible to find the cut end again.
I also learned that its best if the cut end hangs out of the box by 100mm and has a loop on the end, the first photo shows good (learned) practice.
The second photo shows what you end up with after you have sorted out the mess when you lose the end.
IMG_3682.jpg
IMG_3681.jpg
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30th Nov 2020, 02:08 PM #822I break stuff...
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Couldn't you just have the wire end come out one slot, then tuck the end back in at the next slot around to save on bending loops in the end? So for the top example pictured, just tuck the end into the lower left slot.
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6th Dec 2020, 01:57 PM #823Most Valued Member
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- Geelong, Australia
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Picked up the mapp torch to heat up a bit of 8mm rod for bending.
It’s one of the Bernzomatic auto ignition ones. Pulled the trigger - could hear gas but no ignition.
Bugger, the piezo must be dead
Grabbed a lighter, and lit it but very low flame, so I think it must be nearly out of gas - maybe why it wouldn’t light on the piezo.
Pull off the cylinder and give it a shake - nope - plenty of gas...
Grrrr - whats going on.....
Removed the nozzle and checked the piezo was working - it was.
Has to be blocked somewhere....
Blow some compressed air up the torch through the mixing holes at the base, but still no change.
Finally - blowing back down the torch produced a small string of spider web. Little bugger must have been up there all along.
I’ve had a crap day so far, but now feel slightly better knowing it’s been better that a certain spider’s one
Steve
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7th Dec 2020, 12:47 AM #824Most Valued Member
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Those little sods can get into the most awkward spots. Glad to hear it's working again.
KrynTo grow old is mandatory, growing up is optional.
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7th Dec 2020, 11:05 AM #825Member: Blue and white apron brigade
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Had a similar thing happen while transferring some bluing (Engine) oil from a 5L container using a narrow necked funnel. It was old-new oil I got from cleaning out deceased FILs sheds last year and it was moving very slowly through the funnel - I noticed the label said it was 50W so I thought maybe its just that viscous - I usually use 30W. The oil stream slowly reduced to just a dribble so I decided to take a look - sure enough it was a dead spider being forced further and further into the funnel neck