Author Topic: Centrifuge photos for Knighty (Read 17870 times)

Jamesrl · « **Reply #30 on:** May 24, 2015, 05:27:27 PM »

Quote from: Julian on May 24, 2015, 04:37:15 PM

Quote from: Jamesrl on May 24, 2015, 12:41:34 PM
Ooooo! I'll 'ave to start looking at making some casting patterns.

You were looking at that several years ago ... feck you're slow!

No I'm not, just not as fast as others and I'm easily distracted.

knighty · « **Reply #31 on:** May 24, 2015, 07:09:13 PM »

will they take much tidying up once they're cast ?

there's a foundry 5min from my work and they;ve done some bits for me before....

Jamesrl · « **Reply #32 on:** May 24, 2015, 08:23:25 PM »

Quote from: knighty on May 24, 2015, 07:09:13 PM

will they take much tidying up once they're cast ?

there's a foundry 5min from my work and they;ve done some bits for me before....

I've spent a few hours in our local foundry and from what I've seen of their work not a lot but it does depend on how good the mold patterns are.

knighty · « **Reply #33 on:** May 24, 2015, 08:46:58 PM »

last time I was in the one I used, they were casting a giant metal cylinder about 10 food diameter... to be used in an mri machine

I was pretty amazed how accurate they could make things :-o

Dickjotec · « **Reply #34 on:** May 24, 2015, 10:01:13 PM »

It is easier with round parts as differential shrinkage should not affect them especially if the dimensions are not super critical as even with a shrinkage rule it is not spot on. They will still need balancing and accurate machining for bearings though.

Jamesrl · « **Reply #35 on:** May 25, 2015, 10:46:08 PM »

Well there's the drawing for the bowl and with a clever bit of ingenuity the same patterns can be used for the core as well as the outer shape.

The foundry use shell core moulds.

Julian · « **Reply #36 on:** May 25, 2015, 10:56:16 PM »

That must be an old one ... it's blue.

Jamesrl · « **Reply #37 on:** May 25, 2015, 11:20:05 PM »

Quote from: Julian on May 25, 2015, 10:56:16 PM

That must be an old one ... it's blue.

No it's not, you told me to use Blue No. 103. FFS.

knighty · « **Reply #38 on:** May 26, 2015, 01:52:20 AM »

Jim do you have a sketchup/stl file so I could print one and take it to the local foundry ?
(even if I have to print it a bit smaller)

or... if you're going to do that, I;ll just wait and buy one from you already done ?

Jamesrl · « **Reply #39 on:** May 26, 2015, 01:07:58 PM »

Quote from: knighty on May 26, 2015, 01:52:20 AM

Jim do you have a sketchup/stl file so I could print one and take it to the local foundry ?
(even if I have to print it a bit smaller)

Yes but I'm on me boot this week so I'll sort out the stl. File when I get back.

Julian · « **Reply #40 on:** May 26, 2015, 02:24:48 PM »

Knighty ... check the bowel is circular when you get the file ... I've heard that Jim scrimps on sides and some times only uses 1000.

Julian · « **Reply #41 on:** May 26, 2015, 02:28:16 PM »

What's the OD Jim? Just wondering if one would fit my static parts.

Also you may want to consider redesigning the lip around the top hole. Oil/bio leaving the lip at high speed will splash badly on the vertical surface that catches it.

If you look at my section, I had a removable cover and no lip.

therecklessengineer · « **Reply #42 on:** May 26, 2015, 07:15:19 PM »

It strikes me that an old brake drum appears to be about the right shape. Just needs a cover.

Or two welded together.

Julian · « **Reply #43 on:** May 26, 2015, 07:23:15 PM »

Quote from: therecklessengineer on May 26, 2015, 07:15:19 PM

It strikes me that an old brake drum appears to be about the right shape. Just needs a cover.

Or two welded together.

Quite like that idea!

knighty · « **Reply #44 on:** May 26, 2015, 11:46:14 PM »

the legit simple centrifuges one has a lip around the tip, not sure why

thought about break drums... but was worried about the weight if it went bank :-o

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Centrifuge photos for Knighty