How much would this cost?

[SRT Mike]

I sort-of asked this before.

But..

Imagine a motorcycle tail light. It has a black ABS plastic back plate, and a clear acrylic front plate. Sizes are roughly the size of your hand (in general). Some of them have fancy fresnel lens inserts - assume those are not necessary.

What sort of cost would be involved in taking an OEM factory tail light and reproducing it? The idea is that the OEM light uses bulbs and the aftermarket part will be LED, with a custom circuit board installed. The OEM light would be slightly changed from OEM (i.e. maybe moving the mounting bosses to facilitate mounting of a circuit board).

What sort of cost/volume is involved here?

I know the OEM's use things like carbide square rods precision ground and bolted together to create the textured lens surfaces with great precision. But consider much of the Chinese import stuff - they are not nearly so precise. Let's say the mold doesn't need to be able to run more than a few thousand parts (maybe 6061 or 7075 AL?). All the light lenses are straight pull molds.

What would the price range be to get such a mold made, and what volume an cost-per-part would we be looking at?

I have heard mold prices from $2k to $40k, per-part costs from $0.30 to $5.00 and volume req's from 4k to 100k units. As a datapoint, there are other companies selling reproduction OEM lenses for $35, with a circuit board installed. This is the retail price, meaning dealer price must be more like $20, and the OEM is making money at $20 (after shipping), so I figure they can't be into the lens for more than a few bucks.

I'm looking to get into a price point of hopefully $5 for the front and back of the lens. And I am looking not to front many thousands up front. And I'm hoping to buy maybe 500-2000 parts a year over a product life of 4-5 years. I know that may sound 'off' to some, but, 2-3 other companies are already doing this - so if it's not possible, how are they doing it?

I have no molding experience, but we have plenty of machining experience. What would the feasibility be of buying a molding machine and learning to do this ourselves? I know the principles of mold design (drafts, runners, sprues, part thickness, bosses, gussets, etc) but I've never machined a mold or run a molding machine. Would it take me years to get up to speed with a mold, or could I possibly machine my own mold out of AL and be molding parts in a matter of months?

Thanks - I apologize for being a total n00bie when it comes to this subject.

[turmite]

Hi Mike,
My first suggestion would be to proof the part, then have a 3d model made or make it yourself if you have 3d cad experience. I understand your desire to get a target price before doing the needed work as I have been in the same boat many times, and is the reason I feel qualified to give you some direction.

There are small mold companies out there that will work with you but not in hundreds of parts at a time. They can run several hundred parts in a few hours and it is simply not worth their time for the set up. I hate that phrase, but after having experience with it myself, I do understand it better.

Have you proofed the idea?
Can you provide the 3d model?

Answer those two questions before you go on and it will make the process a little easier.

Mike

[mc_n_g]

If you have something already I would try one of the rapid prototype places first to see what type of cost there is and feasability.
Right now you have too many variables. Too many possible changes which cost money.
mc_n_g

[InspirationTool]

Can you machine them instead, and then vibratory finish them to polish them?

-Jeff

[Kipper]

I've been thinking of replacing the entire rear light on my motorcycle for some time and think it will cost me roughly £10 to do it. Fortunately I have materials left over from many years ago when I made lights for some 1/2 scale cars I made for my kids. I must see if I can find some pictures :beer: My method was to use "vinamold" and UV stabilised resin and hand make the mould....Oh how times have changed...I can CNC the mould's now :yay:

[SRT Mike]

Here are some pics of a particular motorcycle tail light I want to replicate.

The back





The front




Iso view of front





To answer specifics:

Turmite, the thing is - these are already molded parts - so things like draft angles, thicknesses, etc have already been designed in. I have not modeled the part, because it's a relatively complex 3D shape, and it would take almost no time to laser scan it, whereas if I put it on the machine and uses the probe head, it would take hours if not days and whomever was gonna mold it would be re-doing it anyway


mc_n_g - I thought the variables were pretty constrained? I dunno, maybe I am wrong. In the case of the pics I posted, I want exactly what is shown. There are a few cases where instead of a mounting boss in one place, I want it in another place, or instead of a tab that slides through a board, I want a mounting boss. But nothing that would complicate the mold design (actually everything I'd change would make it easier).


Inspiration - the problem with that is firstly that vibratory finishing them would round all the edges, which will make the lens look like crap (i.e. won't do any diffusion really). Secondly, the light is maybe 5" wide, 4" high, and about 5" deep. So we'd be talking a BIG chunk of acrylic to start with, and many hours of machining. And I can't even imagine machining a few thousand of 'em




I was wondering if there was some acrylic casting process, although I don't think there is. I know you can cast resin, but not with the clarity I need. I also had considered thermoforming. Maybe taking a flat sheet of 1/8" acrylic, and heating it up until it's pliable, then putting it on a positive image of the inside of that tail light, letting it "droop" over it, then clamping on a top section such that the cavity between is exactly what I want my finishe part to be. But I figure if it was as easy as that, then such parts as above would not be injection molded.

Thing is - the fact remains that various manufacturers make these. I used to sell some and I know the market is a thousand a year MAYBE on a hot seller, and the products run from 2 to 4 years in production. Other companies sell these parts for a price that lets me know there is only a few bucks in the plastic parts at most. So I'm wondering if I can approach a price of perhaps $10/part (part meaning clear front and plastic back) by having someone do the molding for me? Or if I would have to do the molding in-house to get that level of price?

Same with machining I guess... we have a lot of AL parts we make. If I had to outsource them, I could never make them at a cost that allows me to sell them on to distributors. But if I make them in-house, we do the fixtures and set-up, spend $3 in raw AL and can cost the part at $5 with machine time. If I was getting them made by someone else, they'd be $15-20/part or more, depending on how many I needed.

So, with the info above, can anyone guesstimate a ballpark cost to do a mold, an a per-part cost (on the acrylic lens + ABS back plate)??? Or is this something I'm gonna have to figure out how to do in-house (injection molding)?

Thanks!

[mc_n_g]

Holy $hit that is a nasty part to redesign from scratch.
The little angles and curved surfaces are not nice at all. To redo without a CAD drawing or a full scan would not be fun. The little scallops on the bottom are not nice either. That is at least a 3 piece mold. It might be doable in 2 but tough parting line with the pattern in the lens.
The amount of polish for the surface for acrylic is nuts with all the little angles. Definite need for chromed surface.
If you are truely serious I would try to get someone to laserscan it to get a point of clouds model to start from.
I would try to cast one from a silicone mould and use pourable clear resins with vacuum to pull out the bubbles. You might be surprised.
The problem is there is no way to mass produce the mold. You have to keep on remaking the silicone to generate a few molds.
You are going to have to make a lot to recover teh cost of the mold if you go the machining way. The price of plastic is not the problem. It is the cost of the design, mold and polishing (possible chrome cost too). With acrylic the surface finish will drive your clarity. Small swirls will form from non-smooth surfaces cause ripples in the intial plastic skin.

mc_n_g

[turmite]

Originally Posted by SRT Mike To answer specifics: Turmite, the thing is - these are already molded parts - so things like draft angles, thicknesses, etc have already been designed in. I have not modeled the part, because it's a relatively complex 3D shape, and it would take almost no time to laser scan it, whereas if I put it on the machine and uses the probe head, it would take hours if not days and whomever was gonna mold it would be re-doing it anyway Mike if you do a search in the RFQ/Employment forum here on the zone there is a company that posted late last year/eearly this year that was a scanning company. To scan and provide a stl was not all that bad for something much larger than your part. Problem is you part is actually two so....... Anyway if you can't find them let me know and I will try to dig up the email, assuming I still have it. mc_n_g - I thought the variables were pretty constrained? I dunno, maybe I am wrong. In the case of the pics I posted, I want exactly what is shown. There are a few cases where instead of a mounting boss in one place, I want it in another place, or instead of a tab that slides through a board, I want a mounting boss. But nothing that would complicate the mold design (actually everything I'd change would make it easier). Inspiration - the problem with that is firstly that vibratory finishing them would round all the edges, which will make the lens look like crap (i.e. won't do any diffusion really). Secondly, the light is maybe 5" wide, 4" high, and about 5" deep. So we'd be talking a BIG chunk of acrylic to start with, and many hours of machining. And I can't even imagine machining a few thousand of 'em I was wondering if there was some acrylic casting process, although I don't think there is. I know you can cast resin, but not with the clarity I need. I also had considered thermoforming. Maybe taking a flat sheet of 1/8" acrylic, and heating it up until it's pliable, then putting it on a positive image of the inside of that tail light, letting it "droop" over it, then clamping on a top section such that the cavity between is exactly what I want my finishe part to be. But I figure if it was as easy as that, then such parts as above would not be injection molded. Thing is - the fact remains that various manufacturers make these. I used to sell some and I know the market is a thousand a year MAYBE on a hot seller, and the products run from 2 to 4 years in production. Other companies sell these parts for a price that lets me know there is only a few bucks in the plastic parts at most. So I'm wondering if I can approach a price of perhaps $10/part (part meaning clear front and plastic back) by having someone do the molding for me? Or if I would have to do the molding in-house to get that level of price? Same with machining I guess... we have a lot of AL parts we make. If I had to outsource them, I could never make them at a cost that allows me to sell them on to distributors. But if I make them in-house, we do the fixtures and set-up, spend $3 in raw AL and can cost the part at $5 with machine time. If I was getting them made by someone else, they'd be $15-20/part or more, depending on how many I needed. So, with the info above, can anyone guesstimate a ballpark cost to do a mold, an a per-part cost (on the acrylic lens + ABS back plate)??? Or is this something I'm gonna have to figure out how to do in-house (injection molding)? If you have in-house injection molding this is going to be your least expensive option, aside from the mold cost of course. Thanks!

Mike

[ltmquik]

Your best bet for the quantity, 1000 pcs per year and a six (6) year life, would be an aluminum injection mold, two (2) cavity (1+1 family) mold with a runner shutoff (for the two different materials).

By my quick guess you would be looking at around $9,500.00 US in mold costs. The parts cost would be around $10.00 for the two parts.

If you want I can have my plastic injection molding company (Plastic Model Engineering, Inc.) provide you with a formal quote. I will need more detailed information and maybe a sample part.

Thank you.

[Kipper]

Originally Posted by SRT Mike Here are some pics of a particular motorcycle tail light I want to replicate. The back The front Iso view of front To answer specifics: Turmite, the thing is - these are already molded parts - so things like draft angles, thicknesses, etc have already been designed in. I have not modeled the part, because it's a relatively complex 3D shape, and it would take almost no time to laser scan it, whereas if I put it on the machine and uses the probe head, it would take hours if not days and whomever was gonna mold it would be re-doing it anyway mc_n_g - I thought the variables were pretty constrained? I dunno, maybe I am wrong. In the case of the pics I posted, I want exactly what is shown. There are a few cases where instead of a mounting boss in one place, I want it in another place, or instead of a tab that slides through a board, I want a mounting boss. But nothing that would complicate the mold design (actually everything I'd change would make it easier). Inspiration - the problem with that is firstly that vibratory finishing them would round all the edges, which will make the lens look like crap (i.e. won't do any diffusion really). Secondly, the light is maybe 5" wide, 4" high, and about 5" deep. So we'd be talking a BIG chunk of acrylic to start with, and many hours of machining. And I can't even imagine machining a few thousand of 'em I was wondering if there was some acrylic casting process, although I don't think there is. I know you can cast resin, but not with the clarity I need. I also had considered thermoforming. Maybe taking a flat sheet of 1/8" acrylic, and heating it up until it's pliable, then putting it on a positive image of the inside of that tail light, letting it "droop" over it, then clamping on a top section such that the cavity between is exactly what I want my finishe part to be. But I figure if it was as easy as that, then such parts as above would not be injection molded. Thing is - the fact remains that various manufacturers make these. I used to sell some and I know the market is a thousand a year MAYBE on a hot seller, and the products run from 2 to 4 years in production. Other companies sell these parts for a price that lets me know there is only a few bucks in the plastic parts at most. So I'm wondering if I can approach a price of perhaps $10/part (part meaning clear front and plastic back) by having someone do the molding for me? Or if I would have to do the molding in-house to get that level of price? Same with machining I guess... we have a lot of AL parts we make. If I had to outsource them, I could never make them at a cost that allows me to sell them on to distributors. But if I make them in-house, we do the fixtures and set-up, spend $3 in raw AL and can cost the part at $5 with machine time. If I was getting them made by someone else, they'd be $15-20/part or more, depending on how many I needed. So, with the info above, can anyone guesstimate a ballpark cost to do a mold, an a per-part cost (on the acrylic lens + ABS back plate)??? Or is this something I'm gonna have to figure out how to do in-house (injection molding)? Thanks!

You "know" that? This is my son at age 5...He cant fit into this any more as being 6'4" it's a trifle hard but the lights are still crystal clear as per the manufacturers statement "Crystal clear UV resistant resin will not cloud or crack" 1928 SSK "toy" car sold for a tidy sum 5 years ago. I may add that it was all handmade from steel and wood and travelled 20 miles before recharge.

[dansutula]

This is right up their ally! They can do this cheaper and faster than anyone in the industry. They have made at least a 1/2 dozen molds/parts for me, and I've never been disappointed and have often been amazed by their process. You will however, need a CAD model to upload to their automated quote process. You may want to find someone with a Nextengine type scanner as a start to building your CAD model, or a good reverse-engineer. 1,000-10,000 parts should be no problem in an aluminum mold with un-filled resin. The downside with ProtoMold is that the per part cost will never go down that low. Your part might cost $4-$6 or more even in moderate volume.
Good Luck!
Dan

[ltmquik]

Originally Posted by dansutula This is right up their ally! They can do this cheaper and faster than anyone in the industry. They have made at least a 1/2 dozen molds/parts for me, and I've never been disappointed and have often been amazed by their process. You will however, need a CAD model to upload to their automated quote process. You may want to find someone with a Nextengine type scanner as a start to building your CAD model, or a good reverse-engineer. 1,000-10,000 parts should be no problem in an aluminum mold with un-filled resin. The downside with ProtoMold is that the per part cost will never go down that low. Your part might cost $4-$6 or more even in moderate volume. Good Luck! Dan

We provide the same service as ProtoMold but offer guarantees on our tooling.