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It is currently 07 Dec 2019, 01:57
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miskia
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Post subject: Re: Let's resurrect the VNL1779 / VNL1700  Posted: 14 Mar 2019, 13:50 |
Genuinely interested |
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Joined: 29 Dec 2018, 10:33 Posts: 34 Location: Belgium Has thanked: 1 time Been thanked: 10 times
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So, I received the first prototype today and I'm very impressed. It seems much stronger than the original part. Here is 2 pictures:   When I'll be back home I'll try to assemble the holder with the gears on the pickup. Maybe some sizes will need to be ajusted, but this first result is promising I'll let you know my results 
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signofzeta
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Post subject: Re: Let's resurrect the VNL1779 / VNL1700  Posted: 14 Mar 2019, 16:24 |
Confirmed Padawan |
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Joined: 14 Jan 2010, 09:44 Posts: 3864 Location: United States Has thanked: 107 times Been thanked: 233 times
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takeshi666 wrote: I was thinking more in terms of reverse engineering a new mold from an existing part. I just wonder where the mold would actually split so the cast can be removed, and how much additional work it'd still require, like drilling the necessary holes in it. I see what you are saying. To re-cast it in halves, and yeah I don’t know exactly where the seam would be but it would be possible. The original part is made from a drawing into a steel mold and the plastic is injected at like 1000+psi. You can’t make those kinds of molds out of silicone and without that pressure you can’t make strong parts. It’s a labor intensive process for the mill and the hand cleanup afterwards but it does produce thousands of perfect parts every time for pennies. There are newer resins that will cure at zero pressure and behave closer to thermoplastics but I haven’t tried them. I’ve been meaning to but not for a part like this since I think it’s doomed. Let’s see how this part he made works. I’m worried it’s maybe too hard/brittle and the friction will be different in which case it should just need to have metal pins installed into it.
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ldfan
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Post subject: Re: Let's resurrect the VNL1779 / VNL1700  Posted: 14 Mar 2019, 18:04 |
True fan |
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Joined: 28 Jun 2014, 05:59 Posts: 453 Location: San Francisco, CA USA Has thanked: 34 times Been thanked: 74 times
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Hope it does work out  . If so, I will save a good number of post 1995 players. 
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takeshi666
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Post subject: Re: Let's resurrect the VNL1779 / VNL1700  Posted: 14 Mar 2019, 20:44 |
Hardcore fan |
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Joined: 01 Feb 2018, 02:41 Posts: 1116 Location: Finland Has thanked: 36 times Been thanked: 69 times
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signofzeta wrote: I see what you are saying. To re-cast it in halves, and yeah I don’t know exactly where the seam would be but it would be possible. The original part is made from a drawing into a steel mold and the plastic is injected at like 1000+psi. You can’t make those kinds of molds out of silicone and without that pressure you can’t make strong parts. It’s a labor intensive process for the mill and the hand cleanup afterwards but it does produce thousands of perfect parts every time for pennies. I was thinking of casting it from some other material anyway, like aluminum, which wouldn't require injection molding pressures, just tolerance to extreme temperatures.
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kris
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Post subject: Re: Let's resurrect the VNL1779 / VNL1700  Posted: 15 Mar 2019, 14:13 |
Hardcore fan |
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Joined: 05 Dec 2006, 19:08 Posts: 1097 Location: Belgium Has thanked: 13 times Been thanked: 1 time
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feeling happy about myself now Bought 20 spares 2 years ago along with belts etc. They we're dead cheap straight from Japan trough Pioneer Belgium Nice job on the molding btw.
_________________ CLD-D925 LD-V4400 Lexicon LDD-1 Lumagen Radiance XD SR-7007 RMB-1585 DMP-UB900 TX-58DX780E
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kb0iic
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Post subject: Re: Let's resurrect the VNL1779 / VNL1700  Posted: 07 May 2019, 01:28 |
First post |
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Joined: 22 Feb 2019, 22:57 Posts: 1 Location: United States Has thanked: 1 time Been thanked: 0 time
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kris wrote: feeling happy about myself now Bought 20 spares 2 years ago along with belts etc. They we're dead cheap straight from Japan trough Pioneer Belgium Nice job on the molding btw. I sure wish I did that when I needed parts back in 2013. I have two D604’s. One I have for parts as the M holder broke. The partial working D604 I’m hoping isn’t completely broke, but we definitely need a good source to keep these players going. Hopefully we hear back from miskia, soon.
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signofzeta
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Post subject: Re: Let's resurrect the VNL1779 / VNL1700  Posted: 07 May 2019, 03:31 |
Confirmed Padawan |
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Joined: 14 Jan 2010, 09:44 Posts: 3864 Location: United States Has thanked: 107 times Been thanked: 233 times
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takeshi666 wrote: signofzeta wrote: I see what you are saying. To re-cast it in halves, and yeah I don’t know exactly where the seam would be but it would be possible. The original part is made from a drawing into a steel mold and the plastic is injected at like 1000+psi. You can’t make those kinds of molds out of silicone and without that pressure you can’t make strong parts. It’s a labor intensive process for the mill and the hand cleanup afterwards but it does produce thousands of perfect parts every time for pennies. I was thinking of casting it from some other material anyway, like aluminum, which wouldn't require injection molding pressures, just tolerance to extreme temperatures. Casting aluminum that small and precise is a job for masters. Very very hard...some pressure would help. Maybe zinc...but honestly I’d try to avoid making the part stronger than OEM. That can lead to unforeseen issues from my experience. In today’s world parts like that, if made of metal, would be made using a powdered metal forging. blam1 wrote: The thing that has baffled me is the difference between the final drive gear on the LD pickup vs the DVD pickup. On the DVD, the final gear is split in two with spring tension between the two halves. Any idea what is up with this? I’d assume it’s for lash compensation (like the cam gear on a CR TDI VW) or shock mitigation (like the big swinging bridge on the LD-W1) but I don’t have a picture. Probably the laser either moves quicker when reading DVD or it needs more accuracy.
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remav
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Post subject: Re: Let's resurrect the VNL1779 / VNL1700  Posted: 28 Aug 2019, 06:06 |
Honest fan |
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Joined: 15 Aug 2018, 02:00 Posts: 80 Location: United States Has thanked: 3 times Been thanked: 8 times
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locutus2000 wrote: Could you share the 3D model so we could print it ourselves as well? ...and upload it to thingiverse or similar?
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