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working with steel
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timmeh
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Joined: 20 Jul 2004
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quote:
Originally posted by Valen:
anybody tried the $30 bunnings drill sharpernes?


Iv got one but i think it was only $10 i cant remeber but it works great dose a good job just make sure the stones that come with it arent broken as the guy at bunnings told me people drop them sometimes.

Heres a pic of one http://robowars.org/forum/album_pic.php?pic_id=317

It attaches to your electric drill.
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Post Sat Oct 23, 2004 10:29 am 
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Nick
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I like the home brew coolant recipe, I rang a few machinery supply places and a "heavy duty" pro coolant was around $120 for 5 litres. That's right up there with a good red wine and lots of other, more interasting liquids...
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Last edited by Nick on Sat Oct 23, 2004 10:57 pm; edited 1 time in total

Post Sat Oct 23, 2004 9:34 pm 
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Glen
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heh maybe you should just go down to the liqour land and use some cheap moonshine as a coolant Very Happy

well today i had great success drilling 16 holes straight through 9mm thick steel with crappy drill bits. 600rpm speed and using a silicon spray wd-40 knockoff in an aerosol can. never stalled it once and the drill is still pretty sharp.

wasnt as bad as i thought it was going to be.. in fact drilling the 1.6mm thick steel computer case is tougher on the bits.
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Post Sat Oct 23, 2004 10:03 pm 
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Totaly_Recycled
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I find the 30 grade oil to be ok you could experiment with lighter or heavier grades if you wanted i genarly use Brigs and straton mower oil as its a 30 grade and is not too expensive . the oil just helps with friction and also stops the rust forming the water is the bit that does the cooling the detergent makes the oil emulsify and also lets the water spread on the metal surface water on its own doesnt stay on the metal properly . you used to be able to buy soluable oil from garages years ago for puting in radiators but i havent seen ut around for a long time it was also prety cheap . vegie oil might be ok but it usualy goes sticky so would probaly make more mess than its worth .. if you just wat to do an experiment mix one teaspoon oif vegie oil in a cup with one of dish washing deteregent then add some water .. it will give you an idea of what the coolant looks like.

I guese you could spend heaps on money on super u beut coolants but i doubt in the long run you will find much difference unles you are doing real high speed presision cuting of hardened aloys ect that demand super coolants ect

Post Sat Oct 23, 2004 11:02 pm 
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timmeh
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What is a good grade steel to make a pussy cat style blade out of?

No more then 6mm thick.
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Post Wed Nov 17, 2004 6:48 pm 
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Glen
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well it would have to be frucking hard if its only 6mm, so i guess hardened tool steel, chrome vanadium, bisaloy, hardox. maybe titanium?

not sure if stainless could be used...

dont forget 6mm titanium would be pretty strong as well Smile
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Post Wed Nov 17, 2004 7:17 pm 
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