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Author Topic: Casting Aluminium (not aluminum, you yanks just cant spell gooder!!!!)  (Read 41122 times)

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SPEC

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Re: Casting Aluminium (not aluminum, you yanks just cant spell gooder!!!!)
« Reply #105 on: December 30, 2008, 05:49:52 AM »
Quote from: Masterfabr on December 29, 2008, 08:11:32 PM
Spec, he's using roller chain.


Duh,
What was I thinking ???
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Online fabr

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Re: Casting Aluminium (not aluminum, you yanks just cant spell gooder!!!!)
« Reply #106 on: December 30, 2008, 05:54:31 AM »
Boost,That's the general idea. You may have others.  Changing sprocket sizes and such in an enclosed unit will ,I'm sure you will see when you actually draw it up, require a much larger case than you will likely be willing to accept.YES,I've learned a few things while researching alternatives to what most do. I also learned why some things are NOT done. It would SEEM like a tensioner would make the changes of ratios easy with simple sprocket changes wouldn't it? Draw it up in cad and you will quickly see what I'm talking about..
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Offline Boostinjdm

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Re: Casting Aluminium (not aluminum, you yanks just cant spell gooder!!!!)
« Reply #107 on: December 30, 2008, 02:08:32 PM »
I'm not really concerned with Easy or Quick sprocket changes, cuz it will prolly be a matter of dropping or adding a tooth or two to the top shaft and then will be left alone when I am happy with the results.  What about an eccentric carrier that is piloted into the case sides and has like three offset bolt patterns.  Each one placed for a different ratio to make the chain taught.  The carriers would be on the outside of the case with through holes. and the case would have blind holes.  that way I could bolt it together, run it, and if I want to change  a tooth or two I could take it back appart and do it without any additional machining.  Maybe I will draw something up later, but I really should get to work on the house since I haven't done shit for almost a week.
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Online fabr

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Re: Casting Aluminium (not aluminum, you yanks just cant spell gooder!!!!)
« Reply #108 on: December 30, 2008, 02:17:20 PM »
All these ideas sound viable but when you go to calculating center distances with a given chain length you'll run into trouble.All I'm saying is to be VERY careful to not jump to conclusions about what will work. Be very careful in your design if wanting to be able to do what you are indicating.BTDT ,don't know how else to put it. I don't know what sprocket tooth count you're considering but you definitely need to draw up the necessary center to center distances for each  and see if you can get a chain of the appropriate length to work with the combos you are considering within the range of adjustment of the tensioner.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I participate in your fantasy"

artie on edge

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Re: Casting Aluminium (not aluminum, you yanks just cant spell gooder!!!!)
« Reply #109 on: December 30, 2008, 02:29:31 PM »
Quote from: Tone on December 30, 2008, 05:48:42 AM
hi

my 2 cents

the bearing carriers has to be stepped so it sinks into the cases
and no adjustment

cheers

HI Tone, care to elaborate? I know why you are saying this but others may not. i believe your idea has merit but I went the way I did for simplicities sake.
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Online fabr

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Re: Casting Aluminium (not aluminum, you yanks just cant spell gooder!!!!)
« Reply #110 on: December 30, 2008, 02:45:16 PM »
Positive location.Put 2 dowels in the plate and carrier since they're already made  and you're set. No problem.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

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 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I participate in your fantasy"

Online fabr

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Re: Casting Aluminium (not aluminum, you yanks just cant spell gooder!!!!)
« Reply #111 on: December 30, 2008, 02:46:45 PM »
For a fixed setup that is! For eccentric it needs to be  a recessed flange as suggested..
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I participate in your fantasy"

Rick S.

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Re: Casting Aluminium (not aluminum, you yanks just cant spell gooder!!!!)
« Reply #112 on: December 30, 2008, 05:01:12 PM »
Also keep in mind that your chain must always be even pitches in length.
Unless your OK using an offset link. Idler type tensioners suck. It takes a huge amount of travel to tension a chain with an idler.... But.....It would probably work for taking up the small amount of stretch that may occur here.
For playing with different sprocket sizes I agree with Master...Not a good idea.
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tone

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Re: Casting Aluminium (not aluminum, you yanks just cant spell gooder!!!!)
« Reply #113 on: January 03, 2009, 10:01:02 PM »
Quote from: Artie on edge on December 30, 2008, 02:29:31 PM
HI Tone, care to elaborate? I know why you are saying this but others may not. i believe your idea has merit but I went the way I did for simplicities sake.

hi artie

i would like to say i reckon you're doing a great job

i believe you need to have the step into the cases so that the load applied to the shafts is not applied to the bolts holding the bearing carriers but to the cases by the step (large area and close tolerances).
that's why if you have an eccentric carrier with a step you can get the adjustment with the strength .
but to make it as simple as possible i would get the two sprockets with the chain and measure the centres and make it fixed (if the chain stretched go up one tooth on the large sprocket)(also run two plastic guides)
or run a spring type chain tensioner that tensions both outsides of the chain so its tensioned under acceleration and deceleration (extra work)

hope that makes sense

cheers
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Re: Casting Aluminium (not aluminum, you yanks just cant spell gooder!!!!)
« Reply #114 on: January 04, 2009, 04:58:24 PM »
Bad advise on the spring tensioners.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I participate in your fantasy"

Online fabr

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Re: Casting Aluminium (not aluminum, you yanks just cant spell gooder!!!!)
« Reply #115 on: January 04, 2009, 05:02:16 PM »
BTW chains don't stretch,they wear to a longer length. Running that sucker in an oil bath will prevent "stretch" being an issue. Set the chain up taut and forget it.Silent chain is more consistent than roller but you can set it up to the theoretical center distances successfully and not worry about a tensioner..
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I participate in your fantasy"

tone

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Re: Casting Aluminium (not aluminum, you yanks just cant spell gooder!!!!)
« Reply #116 on: January 27, 2009, 05:53:16 AM »
hi

anymore news on the box

cheers
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artie on edge

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Re: Casting Aluminium (not aluminum, you yanks just cant spell gooder!!!!)
« Reply #117 on: February 13, 2009, 02:02:09 PM »
Hi Tone, have had a break since chrissy on this project. I seem to have so many irons in the fire at present. The kitchen reno is looming as well so it seems that some things have to take a backseat, why the fun stuff though?

Ive only drilled the housing for the cover screws and mounting holes to date and am looking at material to make the upper housings. Thread inserts used to allow higher clamping force as Im using fine threads fasteners (6x1mm) which would pull out of the ali pretty quickly



I dont know where faber finds the time to do the stuff he does  ???
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Re: Casting Aluminium (not aluminum, you yanks just cant spell gooder!!!!)
« Reply #118 on: February 13, 2009, 02:06:47 PM »
Need to use SAE threads and youll be fine.... ;D
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Re: Casting Aluminium (not aluminum, you yanks just cant spell gooder!!!!)
« Reply #119 on: February 13, 2009, 02:15:57 PM »
I agree.Forget the inserts and use coarse threads
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I participate in your fantasy"
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