▁to ▁form ▁broad ▁areas ▁of ▁emb roid ery ▁with ▁varying ▁patterns ▁and ▁st itch ▁directions . ▁▁ ▁Ho op ▁A ▁cl amp ing ▁device ▁used ▁to ▁hold ▁the ▁backing ▁and ▁fabric ▁in ▁place ▁in ▁the ▁machine . ▁▁ ▁Running ▁St itch ▁One ▁straight ▁line ▁of ▁st itch es , ▁often ▁used ▁for ▁fine ▁details , ▁out lin ing , ▁and ▁under lay . ▁▁ ▁Sat in ▁St itch ▁Also ▁known ▁as ▁z ig z ag ▁st itch , ▁a ▁sat in ▁st itch ▁is ▁a ▁line , ▁border ▁or ▁edge ▁produced ▁by ▁thread ▁being ▁altern ately ▁st itch ed ▁to ▁either ▁side ▁of ▁a ▁bas eline . ▁Sat in ▁st itch es ▁are ▁generally ▁limited ▁to ▁a ▁maximum ▁of ▁ 1 / 2 " ▁in ▁st itch ▁length ▁before ▁some ▁alternate ▁technique ▁must ▁be ▁used , ▁such ▁as ▁split ▁st itch ing ▁or ▁fill ▁st itch ing . ▁▁ ▁Under lay ▁A ▁stabil izing ▁pattern ▁of ▁emb roid ery ▁which , ▁if ▁used , ▁preced es ▁the ▁main ▁body ▁of ▁sat in ▁or ▁fill ▁st itch ing . ▁It ▁consists ▁of ▁one ▁or ▁a ▁combination ▁of ▁running ▁st itch es ▁for ▁cent ering , ▁ed ging , ▁par alle ling , ▁or ▁z ig z ag ging ▁the ▁design ▁area . ▁ ▁A ▁money ▁and ▁time ▁saving ▁technique ▁is ▁to ▁use , ▁instead ▁of ▁a ▁large ▁amount ▁of ▁emb roid ery ▁thread ▁for ▁under lay , ▁a ▁fancy ▁special ty ▁st itch ▁sa ver ▁patch ▁material ▁that ▁sim ul ates ▁under lay .