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Thread: What did you learn today?
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18th Mar 2016, 09:41 PM #526
Put me down as a +1 for allowing the saw cut under its own weight and the for using good quality blades.
I used a number of different branded blades until I stumbled on Makita friction saw blades which worked quite well on my grungy old GMC friction saw. One thing is for certain and it is that cheap blades will not give you a good result.As noted some are too thin and too flexible
Forcing the saw through the material will cause the blade to distort. I found that part of the trick is to use the saw so as to minimise any rpm loss and let the the wheel speed do the work.
I do recall cutting wheels glazing on the wheel periphery and they may well have been Flexovit brand. I thought it was just me forcing the saw too hard. You may be shocked by how much the blade will distort off square and yet does not shatter.
A dedicated stand goes a long way keeping stock for cutting on the straight and level.
I fitted my saw with a frame with castors to allow me to wheel it outside to spray the sparks outside. The saw has seen no use since I obtained a bandsaw.
Grahame
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19th Mar 2016, 02:59 PM #527Most Valued Member
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Learnt again in this case.
Silver solder has a nasty habit of getting everywhere(especially when you're using a 2" gas touch). Making a scriber for my height gauge and managed to nicely weld a 25*20*9mm packer use to clamp the carbide in place to the job.
Used a carbon arc on an old stick welder box to heat up the packer until it fell off without having the carbide fall off at the same time, so thats a win.
Now I just have to polish it all up again for my first go at blacking.
Stuart
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19th Mar 2016, 03:24 PM #528
brazing carbide
This may have helped you S
How to Braze Tungsten Carbide
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19th Mar 2016, 06:05 PM #529Most Valued Member
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19th Mar 2016, 11:48 PM #530Diamond Member
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Good on you Stu, at least you don't let minor hassles stop you from getting her done to quote one of our favourite Keiths.
Now if you have some conc. HNO3 handy, you can save some time on the cleanup, just keep it away from the metallic bits you want, (I think that the carbide should be OK). Not so human tissue, so keep it well clear of your old bod too, as conc.HNO3 rips flesh in no time flat. I'm sure that you already knew that but perhaps some others don't.
RT
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20th Mar 2016, 10:42 AM #531Most Valued Member
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The carbide stuck just fine. It even survived the grinding(finally got to use my glass lense grinder). A little more polishing* to go before blacking, I'll leave the finial sharpening until after that.
What amazed me was the wicking between two "pretty damn flat", polished(so at least they were clean), unfluxed surfaces that were clamped together.
Funny you should say that, the next process uses 70% HNO3**.
I've been wondering just what effect it will have on the silver solder.
Stuart
*its a lot better than the picture makes it look, something to do with the compression of the .jpg
**time to fess up another "what did you learn today"
No matter how much care is taken some fool can screw things up.
The first bottle of HNO3 I purchased was carefully wrapped in bubble wrap and placed and a cardboard box full of foam peanuts. When I got home I opened the cardboard box to get the silicon grease I purchased at the same time and managed to tip the lot over. All would have been good except the lid hit a piece of steel on the way down and broke. I legged it while I had a think what to do next. Bucket of water, shop towel and some tongs.... was I making nitrocellulose? still they when straight in the water. some pm's and some lime and all is good except having to spend $20 on some more HNO3.
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21st Mar 2016, 09:44 PM #532Golden Member
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The Worm Turns
Today I learned that I can cut a wormscrew and how to load a video on youtube - see my very first video - "The Turning of the Worm" here -
https://www.youtube.com/watch?v=s5LfWQ1caZc&feature=youtu.be
exhilerating stuff eh ?
Was the end result of a few smaller things built previously
Rotary Turntable from an Aldi Gym Weight
The little Angle jig to assist grinding tools was made on rotary table
Indexing jig to help cut spur gears - blatant copy of Harold Hall jig
35 and 55 tooth spur gears to celebrate Pi day last week
Used the little angle jig to help cut the Vee tool for the worm
cut the worm today
The whole process seemed quite forgiving - ie the gears were not perfect but they meshed well enough with the Hercus gears and cut the worm and the worm meshed well with the hercus gears - not so well with my own gears - but they still turned.
Will have another go and try to be more careful.
Resources :
George Thomas Books
Ivan Law Book
Xynudu Youtube Video re gear cutting and website here Cut a lathe change gear
Helicron Website - this is very interesting - will have a go at this method soon - Involute Gears
Bill
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21st Mar 2016, 09:49 PM #533Banned
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21st Mar 2016, 09:52 PM #534Golden Member
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Should be okay now - have never done a youtube video before so didnt know I had to publish it.
Bill
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21st Mar 2016, 10:12 PM #535Banned
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Came out OK. Next step is talking...
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21st Mar 2016, 10:28 PM #536
Was the Aldi weight easy to machine ? I did see them at Aldi but I thought that they would have a hard surface , the type of thing that blunts lathe tools real quick . You will sometimes find those weights in op shops or garage sales . They often end up being chucked out or given away.
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21st Mar 2016, 10:40 PM #537Golden Member
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It wore down the tip of an HSS tool and I ended up using a Tungsten Carbide tool and that worked very well.
Bill
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22nd Mar 2016, 12:34 AM #538Most Valued Member
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Hi Bill,
Any chance of some pics of your Rotary Turntable from an Aldi Gym Weight, or did you do a WIP please ??
KrynTo grow old is mandatory, growing up is optional.
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22nd Mar 2016, 03:32 AM #539
Hello Bill,
The trick with cast iron is taking a big enough depth of cut so you get under the hard surface. Carbide tool bits make this easy, though I have only ever used HSS tool bits on the Myford lathe.
Old bar weights can be picked up for almost nothing at the local scrap yard. I was down there this morning looking for some material and there is a pile of them about 2 foot high on a pallet. The big ones must be 18 or 20 inches in diameter and probably 2 inches thick.Best Regards:
Baron J.
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22nd Mar 2016, 10:27 AM #540