Can someone make me this brake?

NavyCuda

NavyCuda

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I am by no means a CAD designer, but I like to draw things every so often. So I was fooling around in Inventor 2009 and drew this copy of the smith brake but setup for the CZ 858.

I had one issue near the end, the horizontal ports when I chamfered the edges the left side was a visibly larger chamfer than the right side, even though I did them all at the same time, with the same size (1.5mm) When I did the left side 1.0 and the right side 1.5 they looked closer to correct in the view, but there was a minor size difference and still didn't explain why one side would be make a larger chamfer than the other.

I started with a cylinder and used the hole cutter for every hole except the top two that are 45 degrees with the notches. Those holes were made by revolving rectangles to cut the holes/notches from the brake.

brake.jpg
 
Nice job.

Never fudge a solid model.
If the holes are truly horizontal (both sides) then chamfering them will result in identical holes.

Pick the vertical plane cutting through the long axis of the brake. Place your holes on this plane and then cut thru all. Chamfer resulting holes.

This should get you what you are looking for.

Also, make sure your perspective view isn't turned on - sometimes (depending on video card) can can skewer the "look" of the model.
(i.e. solid geometry is okay but view on screen looks off).

L
 
lmar said:
Nice job.

Never fudge a solid model.
If the holes are truly horizontal (both sides) then chamfering them will result in identical holes.

Pick the vertical plane cutting through the long axis of the brake. Place your holes on this plane and then cut thru all. Chamfer resulting holes.

This should get you what you are looking for.

Also, make sure your perspective view isn't turned on - sometimes (depending on video card) can can skewer the "look" of the model.
(i.e. solid geometry is okay but view on screen looks off).

L
Click to expand...

I created a work plane and based it on the large cylinder OD, and a sketch with a center point at the 90 degree. I placed three more center points on a sketch based off the work plane, along the long axis of the brake. I used the hole tool to make through-all holes. I made the remaining holes and cutouts and did the remaining chamfering at the end. From both fixed right or left view point I could see the outline of the chamfer on the other side was greater or less than the side I was viewing.


Due to my non-formal education and trial/learn by error method of drawing in Inventor, I have run into cases where I may not use the ideal tool to do the job and has caused me problems later in the drawing.
 
jcoulson64 said:
Shoot, I'd take a few if you don't mind as long as you were making them; assuming you do a small run.
Click to expand...

I'm mostly interested in having one made for myself, that being said I would be more than happy to give Sean my drawing if there was demand for it.

Other considerations is that this is a very close copy of the Smith Enterprises brake, so a one-of may not be considered stealing someone else's idea, but a production run might.
 
NavyCuda said:
I am by no means a CAD designer, but I like to draw things every so often. So I was fooling around in Inventor 2009 and drew this copy of the smith brake but setup for the CZ 858.

I had one issue near the end, the horizontal ports when I chamfered the edges the left side was a visibly larger chamfer than the right side, even though I did them all at the same time, with the same size (1.5mm) When I did the left side 1.0 and the right side 1.5 they looked closer to correct in the view, but there was a minor size difference and still didn't explain why one side would be make a larger chamfer than the other.

I started with a cylinder and used the hole cutter for every hole except the top two that are 45 degrees with the notches. Those holes were made by revolving rectangles to cut the holes/notches from the brake.

brake.jpg
Click to expand...


A couple things;

Nice job on the design, you did a good job

We have a heavy brake coming out that is similar to that brake. It was posted on CGN before shotshow.

You should be able to find a shop to run you 5-7 samples at $50-$60 a piece followed by a run of 50-100 pieces for between $15-$30. You will make more money working directly with someone who actually owns a shop. Ideally you want a facility with lathes that have live tooling, or a mill turn. Our lathes are all bar fed with live tooling and finished parts are removed via conveyor. The less time an operator has to touch material or tooling the lower the shops over head, the cheaper your product.
 
Charles Martel said:
A couple things;

Nice job on the design, you did a good job

We have a heavy brake coming out that is similar to that brake. It was posted on CGN before shotshow.

You should be able to find a shop to run you 5-7 samples at $50-$60 a piece followed by a run of 50-100 pieces for between $15-$30. You will make more money working directly with someone who actually owns a shop. Ideally you want a facility with lathes that have live tooling, or a mill turn. Our lathes are all bar fed with live tooling and finished parts are removed via conveyor. The less time an operator has to touch material or tooling the lower the shops over head, the cheaper your product.
Click to expand...

Am I pretty much going to be limited to having a shop make me a minimum order? I originally was hoping just to have one brake made for myself, I had no aspirations of having anything produced.

I have some "legal" concerns about turning out more than a one-of, especially if there is a chance of profit involved. Is the smith brake patented, or otherwise legally protected?
 
NavyCuda said:
Am I pretty much going to be limited to having a shop make me a minimum order? I originally was hoping just to have one brake made for myself, I had no aspirations of having anything produced.

I have some "legal" concerns about turning out more than a one-of, especially if there is a chance of profit involved. Is the smith brake patented, or otherwise legally protected?
Click to expand...

Why not just get a smiths brake, and have it opened up and re threaded for your vz. Any compentant gun smith can do that for you.
 
Good work on the model. It's too close to another product for me to run. But some people don't care about scabbing designs, so you'll probably find someone willing to run them en-mass if that interests you.

One idea, and probably going to be your best would be to post a ad up at any college that has a manu tech course. Guys are always looking for projects for school and if it serves a real world application then they'll get good credit for it. Best of all machine time and materials are going to be free and you'd probably be surprised what trading a case of beer to a college student would get you. For a one-off design, it might be worth trying out.

Aside from that, any competent manual machine shop could turn this out on a lathe. You could get this spun off at a decent price.
 
NeitArms said:
Good work on the model. It's too close to another product for me to run. But some people don't care about scabbing designs, so you'll probably find someone willing to run them en-mass if that interests you.

One idea, and probably going to be your best would be to post a ad up at any college that has a manu tech course. Guys are always looking for projects for school and if it serves a real world application then they'll get good credit for it. Best of all machine time and materials are going to be free and you'd probably be surprised what trading a case of beer to a college student would get you. For a one-off design, it might be worth trying out.

Aside from that, any competent manual machine shop could turn this out on a lathe. You could get this spun off at a decent price.
Click to expand...

So if I got my self a bunch of 1" bar stock I could turn the basic ID and OD on my southbend... I thought about doing the ports with a drill press, but I know I'll never come anywhere near the quality of a cnc machine.

If I was to have more than one brake made, it looks like they would be somewhere around $60 a peice and down depending on the number made...
 
Without a mill, indexer, angle plates or sine it will never look CNC quality, but since you already have a lathe and drill press and you only want to make one why do you care if it's perfect? It's not like this is something totally original and it's only for yourself. Any half decent machinist could make this easily. Your biggest expense will be the M14x1.0 RH tap unless you have metric gears for that Southbend and can do internal threads.
 
lejarretnoir said:
Without a mill, indexer, angle plates or sine it will never look CNC quality, but since you already have a lathe and drill press and you only want to make one why do you care if it's perfect? It's not like this is something totally original and it's only for yourself. Any half decent machinist could make this easily. Your biggest expense will be the M14x1.0 RH tap unless you have metric gears for that Southbend and can do internal threads.
Click to expand...

My southbend is the old leather belt style... so no metric gears!

I have these really old school milling attachments for my southbend, but I don't understand how they work or if I'm missing pieces or something... but some of the vices have pivot points with the degrees marked on them...

I do, just so happen to have a m14x1.0 RH tap that I used for another project... My problem... I have to build a new bench for my southbend before I can use it again. The bench would be way more expensive than paying someone else to make me my brake on a CNC machine and then getting it parked and it would look much more professional...
 
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