View Full Version : Applying fillets to a foundry pattern

02-07-2018, 08:35 AM
i'm going to show you my wood pattern making process this is for beginners buy building a foundry pattern for a angle plate that i'm going to have cast in this one we are putting in the fillets.

02-07-2018, 09:15 AM
To save everybody the aggravation of watching a poorly done video...he uses Durham brand water putty to form a quarter round fillet on the inside of a 90o corner of his "foundry pattern".

02-07-2018, 11:00 AM
Patternmakers use preformed wax fillets in strips.

02-07-2018, 03:04 PM
"bondo" works well too, and is very durable.:)

02-07-2018, 03:12 PM
I remember from back when I was a kid my father making some patterns for a small local foundry in his wood shop. I seem to recall the fillets were pre-cut strips of leather for the small sizes. Like fillet shaped shoe laces.

02-07-2018, 04:47 PM
Patternmakers use preformed wax fillets in strips. I've never seen the wax ones but I do have some leather fillet strips.
I used them when I was doing pattern works for a vacuum forming co. I used them for the proto type mold. We would run a couple shots off of it to make sure all the dimensions were OK and then make an aluminum water cooled mold off of that.
Wax would not hold up during a test run because of the heat.

I think I used to get the leather fillets from Gilmore Pattern.


02-07-2018, 05:06 PM
When I was teaching hot metals in High school we used the wax fillets. We used green sand and did mostly aluminum and some brass. https://www.freemansupply.com/products/specialty-waxes has many different sizes from 1/16 to 1" in radius.

02-07-2018, 07:15 PM
These are the ones I have, and I believe I did get them from Freeman.


02-07-2018, 09:35 PM
Back in the 1970's when I worked as a pattern & moldmaker in the industrial fiberglass industry I used wax strips. They were laid into the corner then pressed into place and formed using a heated steel ball on a stick. Last year I used some of my 40 year old strips for a fiberglass boat project and they still worked surprisingly well.


02-07-2018, 09:46 PM
Youtube has recently implemented policies that will make it harder for poor quality channels to get any traction - this will reduce the number of these types of threads.

02-08-2018, 08:19 AM
Video Spamming?

Richard P Wilson
02-08-2018, 10:44 AM
Pretty much any water resistant wood filler will do the job. Its what I use because I only do the occasional pattern now and don't have a stock of wax or leather fillets any more. Wouldn't have thought it needed a video for that,its pretty self evident isn't it.
Thing that bothers me more is that I couldn't see any evidence of draft on his pattern anywhere. Maybe its covered on one of his other 100 or so videos, but I'm not going looking.

02-08-2018, 05:21 PM
Video Spamming?

Check his posting history. That's about all he does here.

02-09-2018, 04:22 AM
Patternmakers use preformed wax fillets in strips.

Or leather

02-09-2018, 11:31 AM
yes as well as leather and even wood