Trialnterror
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Now I know that I need to rack my mind on how you came up with that dim. And look at the meanings of tangent
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Hoglet build
- Thread starter Trialnterror
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Help Support Home Model Engine Machinist Forum:
Don't cut any metal yet, that dim is not right, ned to alter my drawing.
J
J
Sorry about that, I drew the engine when I was learning Alibre and just spotted a mistake.
New dimension below of 0.872" I had the slope at 21deg not 25deg.
Also included part of the modeling drawing, I have added a green circle 0.294" dia (0.147R) and extended one of the slopes with a green line. When that green line just touches the edge of teh circle it is said to be tangental to teh circle.
New dimension below of 0.872" I had the slope at 21deg not 25deg.
Also included part of the modeling drawing, I have added a green circle 0.294" dia (0.147R) and extended one of the slopes with a green line. When that green line just touches the edge of teh circle it is said to be tangental to teh circle.
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I did an AutoCad layout and got the same thing as Jason.
The drawing is improperly done. You would never dimension to a curved surface from the datum point. The radius from the center of the center hole should have been spelled out (.147) but it would have been just as easy to add the .872 dimension.
gbritnell
View attachment HOGLET LAYOUT 2.pdf
The drawing is improperly done. You would never dimension to a curved surface from the datum point. The radius from the center of the center hole should have been spelled out (.147) but it would have been just as easy to add the .872 dimension.
gbritnell
View attachment HOGLET LAYOUT 2.pdf
Trialnterror
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Thanks I've been racking my brain on that. Now I want to learn how to do this, but I guess it'd be easier to enter it in autocad
Trialnterror
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I'm on a little break while I move my 6x26 mill out and my newly purchased Bridgeport in. I need to find a 30" newall scale though and I'm taking the sino (uniq) 2 axis DRO off and installing my newall DRO 3 axis
Trialnterror
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Half way done with the cam housing, turned down the fixture so I can bore the holes in the housing.
Trialnterror
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Upside down pics:fan: I even rotated this one
Cogsy
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I'm going to guess you're using an iPhone or iPad to take your pics - they are very stubborn as to which way is 'up' for their pictures. Try holding the device so the 'home' button is to the right and your pics should be right way up.
Trialnterror
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Yes both! iPad and iPhone! Thanks I'll do that!
Look at that it wants the home button on the bottom? Weird?
Trialnterror
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I measured the cam housing dim I was off by .020 so....
I've been racking my brain going crazy with the z axis dimensions. I'd move the knee according to the dro to cut a specific dimension and it'd be off .020 some times and others it be on! I tore into the spherosyn
scale and found that the scale was bent which threw the reader head off by .005 so I readjusted the reader head and used my extra 36" scale temporarily to test out the knee and it works perfectly!
Wow what a headache trying to figure this out!
Time to try and warranty the scale!
Hopefully now this week I'll get back on the project
I've been racking my brain going crazy with the z axis dimensions. I'd move the knee according to the dro to cut a specific dimension and it'd be off .020 some times and others it be on! I tore into the spherosyn
scale and found that the scale was bent which threw the reader head off by .005 so I readjusted the reader head and used my extra 36" scale temporarily to test out the knee and it works perfectly!
Wow what a headache trying to figure this out!
Time to try and warranty the scale!
Hopefully now this week I'll get back on the project
Trialnterror
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I have a serious question? I'm trying to redo my cam housing and there are 3 holes @ 1/2" (R.250) how does a machinist go about machining these holes? I was trying to use an 1/2" endmill
And when I go down an inch it's seems ok but the endmill is an inch cutting surface if I go any further the hole goes out of round and at an inch if I put an dowel pin in it isn't exactly 1/2"?
So would you drill 1/64 under 1/2" (31/64?) then ream ? Or are these dim even that critical and a 1/2" drill bit would suffice?
This seems petty but I struggle with this?
And when I go down an inch it's seems ok but the endmill is an inch cutting surface if I go any further the hole goes out of round and at an inch if I put an dowel pin in it isn't exactly 1/2"?
So would you drill 1/64 under 1/2" (31/64?) then ream ? Or are these dim even that critical and a 1/2" drill bit would suffice?
This seems petty but I struggle with this?
Can't quite remember how I did mine but probably drilled it out in a couple of stages to 7/16" and then plunged down with a 1/2" 2-flute milling cutter
Trialnterror
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I tried all different kinds of ways and doing this works (7/16" the plung with 1/2" 2 flute)
Along with drilling to 31/64 then ream, all which may be not that critical anyway?
Trialnterror
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Well I finished the cam housing. It's not perfect but it will have to do if I don't move on top the next part I'll never finish. Things I've learned along the way.
1. Pre drill hole then plunge with slot drill (which in US is a two flute endmill from the info I've researched) or with a three flute high angle endmill (which is what I used and it worked well.
2. When finding location of holes on the housing the first dim is laid out, but the second is by degrees (which I've never done before) so example I set up in my small 4" rotary table so I was exactly center then moved to .895 then moved my table to 29°, center drilled, step drilled to 1/64" under 1/4" then reamed 1/4" this worked out great. I was proud of myself for actually doing this! (Hopefully I did it correctly??? )
3. Learned how to cut a radius!
I'll post some pics
1. Pre drill hole then plunge with slot drill (which in US is a two flute endmill from the info I've researched) or with a three flute high angle endmill (which is what I used and it worked well.
2. When finding location of holes on the housing the first dim is laid out, but the second is by degrees (which I've never done before) so example I set up in my small 4" rotary table so I was exactly center then moved to .895 then moved my table to 29°, center drilled, step drilled to 1/64" under 1/4" then reamed 1/4" this worked out great. I was proud of myself for actually doing this! (Hopefully I did it correctly??? )
3. Learned how to cut a radius!
I'll post some pics
Trialnterror
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Here's the cam housing
Trialnterror
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Oh look I kept the home button to the right and the pictures are loaded right side up!!!!:thumbup:
Trialnterror
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Cover for the cam housing
Trialnterror
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(I've been searching for 3 days now, I found it a week ago put cannot now.)
I am looking for the dimension to place the mill in the center of the flank radius relative to the rotary table for cutting the camshaft.
I'm going to make two shafts, one three lobe like the drawing shows and this is what I'm asking for the dim on. And the other is a four lobe cam by Clarence (he sent me a drawing although I don't know that flank radius center dim relative to the RT either.
Once I have that dim for the three lobe, is there a set start here for the top lobe say that would be 0° and cut all the way around to XXX° just as an example. Then to start the cut for the next lobe put your rotary table on XXX° then move at 4° increments to XXX° Then on to the third cam start here END here.
I hope all this makes sense. I did search for days...
I need to learn the math to find the center of the flank radius relative to the center of the cam and the 3RD
I am looking for the dimension to place the mill in the center of the flank radius relative to the rotary table for cutting the camshaft.
I'm going to make two shafts, one three lobe like the drawing shows and this is what I'm asking for the dim on. And the other is a four lobe cam by Clarence (he sent me a drawing although I don't know that flank radius center dim relative to the RT either.
Once I have that dim for the three lobe, is there a set start here for the top lobe say that would be 0° and cut all the way around to XXX° just as an example. Then to start the cut for the next lobe put your rotary table on XXX° then move at 4° increments to XXX° Then on to the third cam start here END here.
I hope all this makes sense. I did search for days...
I need to learn the math to find the center of the flank radius relative to the center of the cam and the 3RD
