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 Post subject: วิธีทำ หนามกันนกพิราบ Pigeon Bird Spikes
PostPosted: Thu 22 Mar 2018 8:53 pm 
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 Post subject: Re: วิธีทำ หนามกันนกพิราบ Pigeon Bird Spikes
PostPosted: Thu 22 Mar 2018 8:58 pm 
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ruler_60cm.png

Spike numbers should be even numbers. If we make wide and narrow spikes, it will easy to join with another set.

Metric Units
Code:
Space Gap = Length / Spikes
          = 30 cm / 10
          = 3 cm

Left/Right Margins = Space Gap / 2
                   = 3 cm / 2
                   = 1.5 cm


Imperial Units
Code:
Space Gap = Length / Spikes
          = 12 inch / 12
          = 1 inch

Left/Right Margins = Space Gap / 2
                   = 1 inch / 2
                   = 0.5 inch


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 Post subject: Re: วิธีทำ หนามกันนกพิราบ Pigeon Bird Spikes
PostPosted: Fri 23 Mar 2018 1:12 am 
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 Post subject: Re: วิธีทำ หนามกันนกพิราบ Pigeon Bird Spikes
PostPosted: Fri 23 Mar 2018 1:14 am 
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 Post subject: Re: วิธีทำ หนามกันนกพิราบ Pigeon Bird Spikes
PostPosted: Fri 23 Mar 2018 10:10 pm 
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ตารางเทียบเบอร์ลวด

ของไทยนิยมใช้มาตราฐาน BWG
เช่น ลวดเบอร์ 16 = 1.651 มม.

Specific_Gravity_2.png

Ref: https://en.wikipedia.org/wiki/Wire_gauge
Ref: https://sizes.com/materials/wire.htm


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 Post subject: Re: วิธีทำ หนามกันนกพิราบ Pigeon Bird Spikes
PostPosted: Fri 23 Mar 2018 10:32 pm 
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ความถ่วงจำเพาะ (Specific Gravity)

หน่วยเป็น kg/cm²∙m
เช่น SUS304 = 0.793 kg/cm²∙m

ลวดสแตนเลส SUS304 เบอร์ 16 (1.651 mm, 0.1651 cm) ยาว 1 เมตร
= Gs x Pi x (d/2)² x L
= 0.793 x (22/7) x (1.651/2)² x 1 / 100
= 0.01698 kg

ลวด 1 kg จะยาว = 1 / 0.01698 = 58.88 m

Specific_Gravity.png

Ref: http://www.yamco-yamashin.com/en/products/guide_specific_gravity.html


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