Mark P
  • Sunnyvale, CA
  • United States
  • Markgawa
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Latest Activity

Matthew Valancy commented on Mark P's blog post Epoxy filling method for brushless motors
"The motor bell? I think the magnets rust too but the motor core is the most important part, starting with replacing the bearings. "
May 4
Tom-Vidar Salangli commented on Mark P's blog post Epoxy filling method for brushless motors
"great job...I have a though...is it actually necessary to epoxy the outrunner part? "
May 3
Tom-Vidar Salangli commented on Mark P's blog post Epoxy filling method for brushless motors
"What is the inner and outer measurements of the original bearings to the motors in the V2.6 kit?I am looking for bushings for the motors."
May 3
Matthew Valancy commented on Mark P's blog post Epoxy filling method for brushless motors
"For people following along with Marks motors there are two new related posts available here(part 3) and here(part 2 with video playlist)."
Apr 15
Mark P commented on Matthew Valancy's blog post Dedicated audio server for ROV using Pi and Wolfson Audio board
"Build-a-Hydrophone They are using liquid-tight cord grip and compression nut. http://www.coseetek.net/programs/TTE/acoustics/ "
Apr 13
Mark P commented on Anthony Costanza's blog post Marks Motors Part Deux
"Current prototype Aluminum spacer with drain holes and pressed in underwater bushing material iglide® H370."
Apr 12
Mark P left a comment for Ryan Moran
"Ryan, It has not been released yet but I can send you one late next week."
Mar 13
Ryan Moran commented on Mark P's blog post Biological Sampling Attachment
"Would i be able to order something like this? "
Mar 11
Matthew Valancy commented on Mark P's blog post Epoxy filling method for brushless motors
"Just received my first 2 mark motors today and am upgrading an ROV with some pretty critical salt water motor damage. The top motor is altogether missing the bottom bearing and the prop is no longer removable. Hoping for the best with these after…"
Feb 22
Mark P commented on Matthew Valancy's blog post Marks sea star sampling device
"Attached by fishing line through holes not shown in photo."
Feb 21
Darcy Paulin commented on Mark P's blog post Epoxy filling method for brushless motors
"awesome!"
Feb 21
Mark P commented on Mark P's blog post Epoxy filling method for brushless motors
"Two of the epoxy coated motors are still running.230 hours of fresh water mixed speed operation reverse-stop-forward full motor speed. The teardown has shown galling present at front bearing surface at rear slight wear .001mm and retaining…"
Feb 20
Mark P posted a blog post

Biological Sampling Attachment

Biological Sampling Attachmentmade with commonly available parts and will post design after sea trials (thanks Matt)See More
Feb 20
Mark P commented on Mark P's blog post Epoxy filling method for brushless motors
"The fit is controlled by holes size in support material nominal shaft clearance is approximately .005mm. Both bearnings have been replaced.  Planning on using one thrust washer at rear clip. Waiting on stainless steel clips.…"
Feb 10
quantumquark commented on Mark P's blog post Epoxy filling method for brushless motors
"Mark, You mentioned using the Ingus bushing material.  How was the fit for the  H370SM-0304-03 ?  And what did you use to replace the 3x8x4 bearing? Are you using thrust washers as well?  "
Feb 10
Mark P left a comment for Michael Labonne
"8x3 and 7x3 are the sizes Mark"
Feb 9

Profile Information

Full Name
Markgawa
About Me
Product designer
Hometown
Sunnyvale, CA

Mark P's Blog

Biological Sampling Attachment

Biological Sampling Attachment

made with commonly available parts and will post design after sea trials (thanks…

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Posted on February 20, 2014 at 9:14am — 1 Comment

Right Angle I/O Concept Design

ROV-8.pdf

Internal tube structure to reduce wiring harness inside ROV utilizing right angle connector

Design in…

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Posted on February 3, 2014 at 12:31am — 1 Comment

Bearing replacement for brushless motor

Purposed bearing replacement design for brushless motors used on ROV

Building prototype motor this weekend and will post design after…

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Posted on January 18, 2014 at 1:30am — 4 Comments

Epoxy filling method for brushless motors

I have 3D printed temporary casings with Water Soluble PVA (Polyvinyl alcohol) filament to assist in encapsulation of the motor windings and magnet housing for brushless motors with epoxy. These parts are slip fit and no post machining required. Some touchup required with brush. This PVA material is somewhat pliable and has a bit of give. This is in evaluation phase.  Water test to start next week 1/20.  Material list:

Epoxy West System 105 and 205 hardener (looking at different…

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Posted on January 14, 2014 at 11:30pm — 22 Comments

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