Woodinville Shops

Discuss park gauge trains and large scale miniature railways having track gauges from 8" to 24" gauge and designed at scales of 2" to the foot or greater - whether modeled for personal use, or purpose built for amusement park operation or private railroading.

Moderators: Glenn Brooks, Harold_V

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Topics may include: antique park gauge train restoration, preservation, and history; building new grand scale equipment from scratch; large scale miniature railway construction, maintenance, and safe operation; fallen flags; track, gauge, and equipment standards; grand scale vendor offerings; and, compiling an on-line motive power roster.
Glenn Brooks
Posts: 1447
Joined: Mon Nov 10, 2014 1:39 pm
Location: Woodinville, Washington

Re: Woodinville Shops

Post by Glenn Brooks » Fri Nov 09, 2018 12:59 pm

Decided to outfit the shop to scrape in precision surfaces. So ordered an 18” ‘Featherweight’ straight edge casting from Denis Foster up in Bellingham. Just arrived via UPS yesterday.

The quality of the casting is supberb. Almost no imperfections visible from the sand in the mold. The flat ridge along the top is designed to be scrapped in as a parallel surface. Fascinating idea. The backside is hollowed out to save weight I suppose, and fitted with two gussets that allow for drilling and taping screw holes to mount a handle. Although my initial impression is that the hollowed out back and top parrellel ridge make a perfect natural handhold.

Should have taken photos of the packing material. Denis fitted the cardboard mounting board with cardboard flaps and cross bracing, held in place by use of a glue gun. The flaps encapsulated the entire casting in a pyramidal tube, glued to the backing board. The cross bracing and mounting board was a work of art in itself. Needed to do surgery to free the casting from the mounting board!

All in all a high quality and well thought out design - reminiscent of old school, steam era castings and hand drawn pictures that one finds in bygone foundry catalogs. Thanks Denis!

Glenn
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Moderator - Grand Scale Forum

Motive power : 1902 A.S.Campbell 4-4-0 American - 12 5/8" gauge, 1955 Ottaway 4-4-0 American 12" gauge

Ahaha, Retirement: the good life - drifting endlessly on a Sea of projects....

Harold_V
Posts: 17186
Joined: Fri Dec 20, 2002 11:02 pm
Location: Onalaska, WA USA

Re: Woodinville Shops

Post by Harold_V » Fri Nov 09, 2018 4:23 pm

Glenn Brooks wrote:
Fri Nov 09, 2018 12:59 pm
Although my initial impression is that the hollowed out back and top parrellel ridge make a perfect natural handhold.
Which would also become a perfect source of heat transfer from your hands to the straight edge. Handles are intended to limit heat transfer, which encourages unwanted movement in the straightedge.

H
Wise people talk because they have something to say. Fools talk because they have to say something.

Glenn Brooks
Posts: 1447
Joined: Mon Nov 10, 2014 1:39 pm
Location: Woodinville, Washington

Re: Woodinville Shops

Post by Glenn Brooks » Fri Nov 09, 2018 4:42 pm

Thanks Harold. Never thought about that. I’ve been playing with a design for teak handles riveted to brass frames for the loco. Might be the straightedge is my first prototype Glenn
Moderator - Grand Scale Forum

Motive power : 1902 A.S.Campbell 4-4-0 American - 12 5/8" gauge, 1955 Ottaway 4-4-0 American 12" gauge

Ahaha, Retirement: the good life - drifting endlessly on a Sea of projects....

Glenn Brooks
Posts: 1447
Joined: Mon Nov 10, 2014 1:39 pm
Location: Woodinville, Washington

Re: Woodinville Shops

Post by Glenn Brooks » Mon Nov 12, 2018 4:37 pm

my Dapra scrapper and a couple of carbide scraping bits arrived yesterday. Pleasantly surprised, the bits are preground at 60 and 90 mm radius, with 5* negative rake. Alleviates having to set up a slow speed carbide grinder for the moment.

Anybody know where I could order a decent, cheap, 300 RPM 4” grinding motor? The 600 mm diamond wheels are readily available, but haven’t seen many small size grinders for sale.

Still awaiting spotting ink from two different vendors. Canode Yellow apparently is available only when ordering Hens Teeth. Surprised how few vendors actually service this part of the industry. I’ll try to post a photo when I get out to the shop.

Also did a bit of follow up reading regarding heat transfer from hand holding the straightedge and effects of temperature for determining flatness of reference surfaces. As Harold mentioned, directly holding a straightedge casting will transfer some heat from ones fingertips to the straightedge, possibly altering the surface flatness due to expansion.

I have a Grade B inspection plate (tool room grade) inspection plate. Grade B is inspection grade plate having 4x the variation in tolerance of AA (laboratory grade) and 2x the tolerance of a Grade A (inspection grade) surface. So far as I can tell, only the AA grade labroatory surface is dependent on a temperature controlled environment. So have concluded, in normal usage, the slight variation in flatness tolerance caused by heat transfer from ones fingers to a straightedge likely isn’t a factor with a grade B or grade A straightedges.


Glenn
Moderator - Grand Scale Forum

Motive power : 1902 A.S.Campbell 4-4-0 American - 12 5/8" gauge, 1955 Ottaway 4-4-0 American 12" gauge

Ahaha, Retirement: the good life - drifting endlessly on a Sea of projects....

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