Hanoi Amator Project (HAP)

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Re: Hanoi Amator Project (HAP)

Unread postby Hanoi » Sat Oct 07, 2017 11:32 am

Trying to make Cutting Head without CNC, 3D printer :roll: :roll: :roll:

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Re: Hanoi Amator Project (HAP)

Unread postby jjwharris » Sat Oct 07, 2017 5:57 pm

Hey that's looking great! Are you cutting or embossing? Bryan made some interesting posts about the vta/angle of cutting when designing your cutting head which could be if interest to you.

The posts are on this page https://www.lathetrolls.com/viewtopic.php?f=15&t=5371&start=560
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Re: Hanoi Amator Project (HAP)

Unread postby Hanoi » Sun Oct 08, 2017 8:18 am

jjwharris wrote:Hey that's looking great! Are you cutting or embossing? Bryan made some interesting posts about the vta/angle of cutting when designing your cutting head which could be if interest to you.

The posts are on this page https://www.lathetrolls.com/viewtopic.php?f=15&t=5371&start=560

Thank you Jjwharris, I need to learn more and more!
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Re: Hanoi Amator Project (HAP)

Unread postby Hanoi » Sun Oct 08, 2017 8:29 am

Some more photos of my Cutting Head
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After testing, one side is much vibration, one side less. I think because of the voice coil I made realy not good, I need to make new voice coil to replace them. :o
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Re: Hanoi Amator Project (HAP)

Unread postby Hanoi » Wed Oct 11, 2017 1:06 pm

Some more pictures, not mounted yet!
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Some more things I cant make clear:
- About Dashpot: I saw some one has, someone not so whats the function is ti? Can any one tell me or show me how and what it's structure, can be DIY?
- Count weight: How many grams stylus force on the blank disc should be as normal or if I use this stylus ( I bought 2 this already)? http://www.ebay.com/itm/Vinyl-record-lathe-cutter-head-presto-record-stylus-needle-styli-recorder/122737597253?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D1%26asc%3D41376%26meid%3Dc7a4e0951e2c49cbbc6dd7d385c0a13f%26pid%3D100011%26rk%3D1%26rkt%3D4%26sd%3D122691142804&_trksid=p2047675.c100011.m1850
Had anybody used this kind of stylus, pls give me some comments, I really appreciates for that, thank you!
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Re: Hanoi Amator Project (HAP)

Unread postby jjwharris » Wed Oct 11, 2017 5:35 pm

Hey Hanoi,

From what I understand, the dashpot is to cushion the head, it stops it from dropping heavily on the record it may also provide a cushioning action when on the record.

Those stylus are standard groove stylus, so they won't play well on a microgroove record player, you will get a lot of background noise. You can however emboss with them by turning them around 180 degrees.

In terms of weight, i have had success embossing at 100g, but I know peter king embosses at 150g.

When i was trying to cut, with those same stylus, I had the weight set at 40-60g
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Re: Hanoi Amator Project (HAP)

Unread postby Hanoi » Thu Oct 12, 2017 12:43 am

jjwharris wrote:You can however emboss with them by turning them around 180 degrees...

Thank you jjwharris, I dont understand why should turn around 180 degrees :shock:
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Re: Hanoi Amator Project (HAP)

Unread postby markrob » Thu Oct 12, 2017 8:29 am

Hi,

Nice looking head. It will be interesting to see how it performs. Looks like your moving mass id getting up there in size. Try to get it in the 1-2 gram range if you can.

The dashpot is used to add damping to the head suspension. Since it just a spring/mass system, it will tend to oscillate at its natural resonant frequency. Undamped, it becomes possible to excite this resonance due to platter runnout and slight warps in the blank. Damping is added via the dashpot to achieve critical damping (that is no overshoot or ringing). That leaves you with a second order low pass mechanical filter with no response peak at cutoff. Too much damping is not a good thing as it will slow down the response of the head suspension. Picking the right resonance is also important so that you track disturbances.

You can use a dashpot in the mode described in the other post. That would be in addition to the floating head suspension.

Mark
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Re: Hanoi Amator Project (HAP)

Unread postby Hanoi » Sat Oct 14, 2017 7:29 am

markrob wrote:Hi,

Nice looking head. It will be interesting to see how it performs. Looks like your moving mass id getting up there in size. Try to get it in the 1-2 gram range if you can.

The dashpot is used to add damping to the head suspension. Since it just a spring/mass system, it will tend to oscillate at its natural resonant frequency. Undamped, it becomes possible to excite this resonance due to platter runnout and slight warps in the blank. Damping is added via the dashpot to achieve critical damping (that is no overshoot or ringing). That leaves you with a second order low pass mechanical filter with no response peak at cutoff. Too much damping is not a good thing as it will slow down the response of the head suspension. Picking the right resonance is also important so that you track disturbances.

You can use a dashpot in the mode described in the other post. That would be in addition to the floating head suspension.

Mark

Thank you Mark, however its hard for me to find a dashpot in my local, may use a simple spring instead!
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Re: Hanoi Amator Project (HAP)

Unread postby markrob » Sat Oct 14, 2017 9:14 am

Hi,

You can make one pretty easily. Just imagine a washer attached to a rod that is immersed in a small can containing a viscous fluid (e.g. mineral oil)

See the pictures below of a Presto damper

Damper2.JPG

Damper1.JPG
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Re: Hanoi Amator Project (HAP)

Unread postby jjwharris » Sat Oct 14, 2017 4:21 pm

Hey Mark,

Is a dashpot likely to introduce problems with pitch on a slightly unbalanced platter? (eg. The Stanton 150)
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Re: Hanoi Amator Project (HAP)

Unread postby Hanoi » Mon Oct 16, 2017 10:24 pm

markrob wrote:Hi,

You can make one pretty easily. Just imagine a washer attached to a rod that is immersed in a small can containing a viscous fluid (e.g. mineral oil)

See the pictures below of a Presto damper

Damper2.JPG

Damper1.JPG

Yeah, Mark, I will try to make simple one, hope it help for next test :)
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Re: Hanoi Amator Project (HAP)

Unread postby Hanoi » Mon Oct 16, 2017 10:43 pm

First ever test done, terrible noise ... bub bub bub...
Blank CD disc, it seams too hard for sapphire needle, without heating nor wax and without Dashpot (just a small spring as you can see at pic)
I'll try with Polycarbonate or Acrylic blank, need to find. There's not Lexan Sheet at my local, so I think find the same kind, can anyone tell me what the Lexan sheet it is? plz plz..
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Cheers!
Hanoi
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Re: Hanoi Amator Project (HAP)

Unread postby Hanoi » Tue Oct 17, 2017 8:04 am

Another test with Polycarbonate sheet blank, heat light, however the turntable runs slow down, still crazy background noise. I may confusing about angle of needle, so what should the angle be, back or forwards angle? I really need someones help!? Thank you!
https://flic.kr/p/Yr2uRS
https://flic.kr/p/Z7SVgC
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