For those interested... Bench grinder design.

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wtf?
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For those interested... Bench grinder design.

Postby wtf? » Sat Apr 06, 2013 7:45 pm

I know I rarely post here... But thought someone might be interested none the less. Found some spare steel, so making up a knife makers grinder. And heres the design...

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Will have 250, 200 and 150mm contact wheel, flat platen that can be moved through 120 degree's, 50, 30 and 20mm contact wheels. Plus static and height adjustable tool rest, and can take belts from 1525mm to 3450mm belts. 3hp motor...

Consider me "shared"
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God i LOVE these things.

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Im not sure what weapons will be used to fight WWIII, but i know that WWIV will be waged with wooden sticks.

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Geordie Ross
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Re: For those interested... Bench grinder design.

Postby Geordie Ross » Sat Apr 06, 2013 8:01 pm

Looks good, are you going to custom make the parts or do you have access to a CNC machine?
War does not determine who is right, only who is left.

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wtf?
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Re: For those interested... Bench grinder design.

Postby wtf? » Sat Apr 06, 2013 8:14 pm

The box section is all off the shelf and has been cut manually. Ill use the mill to face off the surfaces so everything is square and dimensionally correct. All the spacers internally are mild steel "polo mints", made up on a lathe. The spacers (externally) will be ally, the complex shapes... In fact, anything made from sheet, I'll use the water jet cutter for and the contact wheels and tracking wheel are off the shelf.

You wouldnt want to CNC any of that, its too simple. The motor is from machine mart. Controler from a company I found on the tinterweb.Theres no need for a CNC on any of it... With the drawings you could get the parts all cut by a water jet dude for next to nothing.
Image

God i LOVE these things.



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Im not sure what weapons will be used to fight WWIII, but i know that WWIV will be waged with wooden sticks.

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Geordie Ross
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Re: For those interested... Bench grinder design.

Postby Geordie Ross » Sat Apr 06, 2013 8:28 pm

Where do you get a water jet that cuts metal? :shocked: I want have a weaponized water jet
War does not determine who is right, only who is left.

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wtf?
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Re: For those interested... Bench grinder design.

Postby wtf? » Sat Apr 06, 2013 8:35 pm

Ha... You just buy one... Not cheap, but still... Any reasonable machine will cut a LOT of material... Ours can cut about 100mm thick material to a tolerance of about 0.3mm on a fast cut. You can get machines to cut stuff about 30mm thick with a accuracy of nearer 0.05mm if you take your time.
Image

God i LOVE these things.



Image



Im not sure what weapons will be used to fight WWIII, but i know that WWIV will be waged with wooden sticks.

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pjm
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Re: For those interested... Bench grinder design.

Postby pjm » Sat Apr 06, 2013 9:40 pm

If i didn't have bad luck i would have no luck at all

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Geordie Ross
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Re: For those interested... Bench grinder design.

Postby Geordie Ross » Sat Apr 06, 2013 9:52 pm

Oh wow they're so cheap, is that only £133k? I think I'll buy 10.... Lol
I was only asking if you had a CNC machine because you have that expensive software, I thought that type of software goes hand in hand with a CNC :roll:
War does not determine who is right, only who is left.

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pjm
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Re: For those interested... Bench grinder design.

Postby pjm » Sat Apr 06, 2013 9:58 pm

yea and that one was 5 year old lmao
If i didn't have bad luck i would have no luck at all

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Geordie Ross
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Re: For those interested... Bench grinder design.

Postby Geordie Ross » Sat Apr 06, 2013 10:17 pm

wtf? wrote:Ha... You just buy one... Not cheap, but still...


You know, even if I was a millionaire, 133k is way to expensive lmao! :brows:
Do you use company / university equipment or something?
War does not determine who is right, only who is left.

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pjm
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Re: For those interested... Bench grinder design.

Postby pjm » Sat Apr 06, 2013 10:18 pm

ya can get cheaper than that one geordie
If i didn't have bad luck i would have no luck at all

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Geordie Ross
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Re: For those interested... Bench grinder design.

Postby Geordie Ross » Sat Apr 06, 2013 10:40 pm

I was expecting maybe 15-30k for a top end one the way he said "you just buy one" lol
War does not determine who is right, only who is left.

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Lone Wolf
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Re: For those interested... Bench grinder design.

Postby Lone Wolf » Sun Apr 07, 2013 8:50 am

I look at those pictures and all I can think is.... do you expect me to talk? No mr bond I expect you to die.

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wtf?
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Re: For those interested... Bench grinder design.

Postby wtf? » Sun Apr 07, 2013 7:39 pm

I was only asking if you had a CNC machine because you have that expensive software, I thought that type of software goes hand in hand with a CNC


You use the same program with the water jet cutter... Just not the 3D component of it. And yeah, borrowing the Uni machine... If you had your own files though, water jet places cut stuff for very little. Once the grinders done, one of the first projects is a 5160 waterjet sword blade. They even sell gas forges for cheap now a days...
Image

God i LOVE these things.



Image



Im not sure what weapons will be used to fight WWIII, but i know that WWIV will be waged with wooden sticks.

User avatar
wtf?
Posts: 1586
Joined: Wed Aug 03, 2005 12:31 am

Re: For those interested... Bench grinder design.

Postby wtf? » Tue Apr 16, 2013 8:21 pm

Update, for those interested....

I decided to lift up the machine more, so I can put the VFD underneath it and put a little perspex door on the front to cover it. And maybe half of the sides... Currently looks like this...

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The base isn't finished... Its all rough cut. And its also placed to balance, which is why the vertical arm doesn't line up with the legs. The arms are ready, with the pivot needing to be shaped and the acetal used for spacers... Just 'cus it cuts so fast.

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And all facing parts will be milled flat, and recessed like this...

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To give a nice welding surface like this...

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Flow cut bits should be done next week and so far the entire thing has cost £98, including 2 nylon contact wheels for testing and fitting, 1 cast iron one. About £100 for the remaining wheels, and the quote for the motor and VFD were well under £700 for a 4hp setup. So that looks to be under grand for a powder coated, 4hp belt grinder, with 2x flat platen and 3 contact wheels, capable of taking belts from 1800mm to over 3500mm... I recon thats pretty good! Or to put it in perspective... A machine half the power, limited to the smallest belt size, from amazon... £3500 and repalcements parts costing the earth. Plus no contact wheels.

Any comments welcomed :)
Image

God i LOVE these things.



Image



Im not sure what weapons will be used to fight WWIII, but i know that WWIV will be waged with wooden sticks.

User avatar
wtf?
Posts: 1586
Joined: Wed Aug 03, 2005 12:31 am

Re: For those interested... Bench grinder design.

Postby wtf? » Mon Jun 03, 2013 11:19 pm

In case anyone... Well... Cares. ;)

Finished all the box section welding... I cant finish the entire frame before the water jet bits get back. So she looks like this so far...

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Ive machined up the flat platen, thusly...

http://img.photobucket.com/albums/v66/G ... c33629.jpg
http://img.photobucket.com/albums/v66/G ... ae5ac4.jpg

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Theres more work needed, but its basically done at the mo... As for rollers and spacers, all made from Acetal...

Bored out using a modifiedl mill bit....
http://img.photobucket.com/albums/v66/G ... 0621ba.jpg

Refined the bearing seats manually...
http://img.photobucket.com/albums/v66/G ... daf692.jpg

To make various rollers, etc...
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Motor shortly. Remaining welding is about 20 minutes worth. Paint and finish, a day. Final fittings (feet, plugs, knobs etc.) half hour. Assembly and fine tuning... A day. Total cost, ~£450. Saving from buying new... ~£2000. Not too shabby... Next, leather workshop!
Image

God i LOVE these things.



Image



Im not sure what weapons will be used to fight WWIII, but i know that WWIV will be waged with wooden sticks.


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