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Thread: Parting the easy way
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26th Nov 2020, 03:59 PM #16Most Valued Member
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I just had a look on ebay and could only find a s/h one https://www.ebay.com.au/itm/Armstron...frcectupt=true
I have no idea where you would get a new one?
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27th Nov 2020, 12:34 AM #17
I'm going to give your idea a go as soon as I have a spare hour or 3. I think my parting on my lathe will be helped from this idea.
Saying that time wise, I still have new lathe tools in packaging that I bought several months back that need loading into one of my 52 tool holders.
I am so glad I went overboard when making 46 extras as I still haven't filled them all, but getting close, lol
PS
Loved seeing your crane go up and working, my home built motorized jib crane trolley is built and so is the powered slew, just the finishing touches/wiring going on, it's been a long project but have learnt a lot about things I knew nothing about.
Good brain stimulating stuff.
Your thread of your progression was really awesome and a massive homeshop crane, the biggest I've ever seen.
Thanks for letting us guys follow your well documented journey in your life with it, much appreciate being part of it, even if it was only from the sidelines.Using Tapatalk
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27th Nov 2020, 08:22 AM #18Most Valued Member
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Hey Dave happy to hear that you are going to build the parting tool and i am looking forward to your testing results.
Thanks also for the kind words, but those are misplaced as you may have mixed me up with steve, oxxandbert, as it was he that
recently built that nice crane jib.
PS your pm box is full.
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27th Nov 2020, 10:03 AM #19
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2nd Dec 2020, 09:30 PM #20
A BIG THANK YOU to ShedHappens for this post.
It was a fantastic rank amateur beginner project for me on the RF30 clone.
I am so glad that I modified the fixed dials on the X & Y axis wheels so they could be reset to zero, as the Z axis is yet to be done and was a confusing thing to deal with, especially when reversing the direction and trying to work out measurements on the dial.
This is my attempt at the parting off tool aid. I have yet to source some brass for the rubbing block, but otherwise it is complete.
Parting off tool aid 1.jpg
Parting off tool aid 2.jpg
Parting off tool aid 3.jpg
Parting tool holder .jpg
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4th Dec 2020, 01:33 AM #21Member
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3
Sent from my SM-G965F using Tapatalk
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4th Dec 2020, 09:22 AM #22Most Valued Member
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G/day Phil, i like the way that you have used the bracket to hold the parting blade, that really simplifies machining by not having to make the blade clamp on the top of the parting block.
I made my brass blocks out of a length of hex tap brass, at least that is what i think it is, not ideal but it works.
A more suitable material would be phoshor bronze or maybe even a plastic, a good suface and lube seems to get a fair bit of parting done before remachining of the surface is needed.
shed
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4th Dec 2020, 01:34 PM #23
Hi Shed, the clamping arrangement came about more or less by accident.
I machined the slot for the parting tool without checking the parting tool itself, rookie mistake,....the parting tool did not have perfectly parallel sides, so it wasn't the snug fit and smooth slide action that I wanted, so I had to machine the tool first, then machine the slot to suit, deeper into the block. It was then that it occurred to me to clamp it with the plate.
I don't have any phosphor bronze at all, or brass of the right dimensions (without having 90% wastage) so I did think about alternatives like plastic.
As it happens I have some 90 duro polyurethane bushing that I might be able to use, however, I was wondering about the slight compressibility of it. Would it compress enough to allow the tool tip to drop and chatter?
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4th Dec 2020, 02:16 PM #24Most Valued Member
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Phil the plastic that i was thinking might work is ptfe.
https://www.ensingerplastics.com/en/.../friction-wear
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4th Dec 2020, 03:51 PM #25
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4th Dec 2020, 08:14 PM #26
Hi Guys,
I think PTFE, Teflon would be too soft for that job ! The plastic cutting boards are not Teflon but might be hard enough to work. At a pinch you could use a piece of Nylon 90.Best Regards:
Baron J.
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4th Dec 2020, 08:58 PM #27
I had a squeeze of the poly I have with pliers, and it did not feel hard enough, so I ended up finding a brass scrap for now. I'll source some Ph. Bronze when I can.
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5th Dec 2020, 04:29 AM #28Senior Member
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Can I suggest you try UHMWPE (ultra high molecular weight polyethylene) I used that to replace the hardened steel bushes in excavator hammers with better results.
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5th Dec 2020, 02:34 PM #29
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5th Dec 2020, 08:15 PM #30
Hi Phill,
Just watch for the chrome wearing through !Best Regards:
Baron J.
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