Author Topic: Holt 75 from Germany  (Read 14178 times)

Offline michelko

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Re: Holt 75 from Germany
« Reply #30 on: July 07, 2022, 06:10:17 AM »
Crank is finished.
i additionaly pinned the webs to the shafts with 3mm drilrod bits. they are also glued with loctite and slightly hammered.
Then milled out the parts between the webs.



The crank looks nice. I am happy with the result.


Offline Roger B

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Re: Holt 75 from Germany
« Reply #31 on: July 07, 2022, 08:45:29 AM »
Nicely done  :praise2:  Multi cylinder engine crankshafts are not easy  :ThumbsUp:
Best regards

Roger

Offline Admiral_dk

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Re: Holt 75 from Germany
« Reply #32 on: July 07, 2022, 12:40:31 PM »
Great looking Crank  :ThumbsUp:

Are you going to put Split Bronze Bearing-Shells in the Block ?

Per

Offline gbritnell

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Re: Holt 75 from Germany
« Reply #33 on: July 07, 2022, 01:11:36 PM »
The engine is coming along great!
Talent unshared is talent wasted.

Offline michelko

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Re: Holt 75 from Germany
« Reply #34 on: July 07, 2022, 04:18:42 PM »
Great looking Crank  :ThumbsUp:

Are you going to put Split Bronze Bearing-Shells in the Block ?

Per
Hi Per,
Yes the three inner bearings will BE Split ones.
The outer will BE one piece.
Michael

Offline Rumelyguy

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Re: Holt 75 from Germany
« Reply #35 on: September 04, 2022, 01:44:27 AM »
Hi All,

I just acquired a Coles Holt engine casting kit. I am in need of the Coles drawings, I would like to purchase any if anyone has something available.

I have no idea if anything is missing in the kit.

Thank you in advance!

Offline michelko

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Re: Holt 75 from Germany
« Reply #36 on: September 13, 2022, 11:22:25 AM »
Hi Guys,
worked a little bit on the Holt. The crank bushings are done.
Made them from bronce. the inner ones are split, the middle bushing has also thrust shoulders.
I am realy happy withe the result. the crank turns nice and smooth.

Michael

Offline michelko

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Re: Holt 75 from Germany
« Reply #37 on: September 13, 2022, 11:27:08 AM »
Here are some Videos how smooth the crank is turning.


<a href="https://www.youtube.com/watch?v=6OWW7GWZxoo" target="_blank">http://www.youtube.com/watch?v=6OWW7GWZxoo</a>

<a href="https://www.youtube.com/watch?v=6qWv1yCOnZQ" target="_blank">http://www.youtube.com/watch?v=6qWv1yCOnZQ</a>

 

Online Kim

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Re: Holt 75 from Germany
« Reply #38 on: September 13, 2022, 05:17:59 PM »
Beautiful work, Michael!  The crank certainly does turn smoothly!  :ThumbsUp: :popcorn: :popcorn:

Kim

Offline gbritnell

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Re: Holt 75 from Germany
« Reply #39 on: September 13, 2022, 09:13:34 PM »
Outstanding work on the crankshaft!
Talent unshared is talent wasted.

Offline Admiral_dk

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Re: Holt 75 from Germany
« Reply #40 on: September 13, 2022, 10:23:43 PM »
Great result on the Crank Michael  :praise2:

Per

Offline RReid

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Re: Holt 75 from Germany
« Reply #41 on: September 14, 2022, 12:22:28 AM »
A lovely piece of work and a major milestone crossed passed. Very well done! :ThumbsUp:
Regards,
Ron

Offline fidlstyks

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Re: Holt 75 from Germany
« Reply #42 on: September 14, 2022, 01:36:46 AM »
Hi All,

I just acquired a Coles Holt engine casting kit. I am in need of the Coles drawings, I would like to purchase any if anyone has something available.

I have no idea if anything is missing in the kit.

Thank you in advance!

There use to be a dealer on eBay who sold a CD of the drawings on eBay. I bought one, they were only like 10 bucks. By the way, where ever did you find the kit? I would like a set.

Offline michelko

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Re: Holt 75 from Germany
« Reply #43 on: October 01, 2022, 12:08:26 PM »
Hi guys,
yesterday i milled the second gear for the valvetrain. The one that goes onto the crankshaft.
It has 25 teeth and is Module 0.9. Made from freeturning steel.
After turning and milling the teeth i broached the keyway with my cnc BF20.
A youtuber named clough42 made some nice content on broaching keyways.

The result is a realy nice keyway and the machine worked just a couple of minutes.
Here is a video from the process:

<a href="https://www.youtube.com/watch?v=hF_Jje2GO6g" target="_blank">http://www.youtube.com/watch?v=hF_Jje2GO6g</a>

and here the gears at work:

<a href="https://www.youtube.com/watch?v=p40uYJzqq0s" target="_blank">http://www.youtube.com/watch?v=p40uYJzqq0s</a>

Regards Michael



Online Kim

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Re: Holt 75 from Germany
« Reply #44 on: October 01, 2022, 04:36:51 PM »
Your gear train looks great, Michael!   :ThumbsUp: :popcorn:

I assume the clamps on the mill are to keep the spindle from turning during the broaching operation?  Interesting use of a mill!

Kim

 

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